Her human form looks and acts childish in stark contrast with her goddess form which not only looks older, but is also more of a cool and mature type.
Neptune is the human form of the CPU Purple Heart. She is often considered to be energetic and dorky and most of all lazy. Her favorite food is custard pudding and she loves playing video games. While she enjoys playing all games, she especially loves Retro video games.
Neptune wears a choker around her neck with a light blue D-pad symbol on it and short sleeved mini hoodie with blue and purple lining around the sleeves and the hood. The hoodie is closed by a button emblem with a large N in the middle and has two strings that look like controller plugs. Underneath she wears a dark purple dress lined with light purple which zips up from the front and has pockets on both sides along with white lining along the bottom. Her socks are light blue and white striped thigh high socks with frills at the tops and her shoes are purple and blue with an N on them.
Neptune is a happy, excitable girl with a very strong sense of justice. Her ditzy personality causes her to be very careless at times which can either help her or land her into serious trouble. She makes friends rather easily due to her friendly nature and often gives them cute nicknames. People admire her optimistic outlook and confidence. She never gives up or backs down when the going gets tough and she makes sure to see her objective through to the very end.
Purple Heart is the goddess form of Neptune. She is considered to be cool, collected, just, and overall much more mature in comparison to her human form. While the personality and appearance change is major between the two forms, she still retains some aspects of her human form albeit to a lesser extent.
Purple Heart has very long purple hair in twin tails and bright blue eyes with white pupils in the shape of power signs. She wears black hair clips with glowing blue D-Pad shapes. Her bodysuit is black and exposes cleavage and has purple and blue lining all around the torso and arms. The middle of the torso has purple mesh, allowing a vague vertical view of her stomach. She also wears thigh high boots with octagon patterns on the side at the very top; one filled it with purple and another just a white outline.
Purple Heart is a serious and mature person. She's often calm and rarely changes facial expressions. She is a very observant and intelligent female, thinking in a rational matter most of the time. She is almost the complete opposite of her human form in many aspects but her strong sense of justice and confidence remains unchanged. Despite her change in personality, there are times that where Purple Heart acts like her human form but to a lesser extent.
The Goddess (Neptune) of Planeptune
In Planeptune, the CPUs of Gamindustri have signed a friendship treaty, banning the use of military force to take Shares. A month has passed since then. Much to Histoire's dismay, Neptune dilly-dallies rather than doing her duties as a CPU. IF and Compa were on their way to see Neptune when they bump into someone who then gives them a flyer. Meanwhile, Histoire points out to Neptune and Nepgear that Planeptune's Shares are slowly declining, shown through the power of the Sharicite. Nepgear points out the reason might be because Neptune hasn't done anything to make the people like her lately. IF and Compa later arrives, and they both agree that Neptune needs to work harder. Much to her chagrin, Compa reveals the flyer's contents, which is a form of protest against the CPUs, resulting in Histoire into lecturing her. Wanting to escape from Histoire's lecture, Neptune decides to "get some schooling of goddess arts" from Noire.
Neptune and Nepgear travels on their way to Lastation. Noire initially declines to help, causing Neptune to tease her. Noire decides to help Neptune on learning the duties of a CPU. Seeing Neptune as a disturbance to her work, Noire takes IF's suggestion of teaching Neptune about being a goddess out on a mission. Neptune accepts the mission, a monster extermination job near Planeptune, that Noire picks for her. With Noire giving some advice on the way, the group travels to the quest's location. Noire hands the task of defeating the overrunning Dogoos in Nasuume Highlands to Neptune. Despite the overwhelming amount of Dogoos present, Neptune succeeds in defeating them all with Nepgear, Compa, and IF's help.
Noire decides to take care of the rest of the monsters and heads to Toruune Cave. In her HDD form, Noire defeats the monsters with ease. She hits a dead end and came across an Ancient Dragon. After taking a hit from another monster, she is reverted back to human form. Noire is overwhelmed until Neptune arrives and helps her. Neptune then transforms to HDD form and defeated the Ancient Dragon. As they exit the cave, a glowing, red object is shown inside the cave. Neptune and Noire finished the mission, earning the praise of the local people. Nearby Arfoire and Warechu is seen and were about to search for something in Toruune Cave.
In Planeptune, the Sharicite's power have increased due to gained Shares, but it is unknown whether it was due to Neptune completing her assigned mission or pictures of Nepgear that she accidentally sent and leaked on the Internet.
The Terrorist (Lickorrist) of Lowee
Neptune, Nepgear, Noire, and Uni go to Lowee to visit. Blanc is doing business with Vert when they get there and Neptune claims that they came to Lowee for its new amusement park, but Blanc replies that Histoire contacted her to teach Neptune what it means to be a goddess. They all decide to go to the amusement park, but Blanc stays behind.
The group has fun at the amusement park. Rom and Ram come across a row of rare reptile coins, which were apparently placed as a lure by Underling and Trick. The twins are captured without hesitation.
Neptune and the group goes back to tell Blanc about her sisters' capture. As Blanc grieves over her sisters' capture, Abnes appears to interview Blanc on her show, Abnes Channel, which is broadcasted all over Lowee. Neptune and Vert drive off Abnes and her crew and suddenly, Blanc collapses.
Vert discloses the details about her proposal with Blanc, which Vert would share Leanbox's satellite imagery service, Terra View, to Blanc if she provides photogenic data of Lowee. At the same time, she is able to pinpoint the location of Rom and Ram's kidnappers, which is located in a ride under construction at the same amusement park they were at recently. Neptune and the other make haste to go rescue the twins, however most of the work ends up being done by the others and Neptune never has the chance to get any action in.
A Weekend (Girls' Night) in Leanbox
Neptune and her friends attend a concert held by 5pb. in Leanbox. After the concert the group wonder where Vert is? They find Vert in her room playing on her MMO, Four Goddesses Online. Neptune wonders if her gaming makes her worse then her to which Noire and Blanc say not a chance. Vert was supposed to have them over for a concert then a party but she is busy with her game. Noire decides the group should prepare for the party anyways.
Neptune is caught slacking off during preparations by Noire and she was promptly put back to work.
During the party, Neptune and Noire are the first to be given the chance to try out Vert's new console. Their appearance changes into Dogoos and they fight each other by bumping into each other. Neptune gets the upper hand in this play fight.
Vert gets a report that a lot of monsters have appeared in a waste disposal plant in the Zune district so the CPUs transform to clean up the monsters. When they arrive Purple Hearts warns them not to charge in headfirst but the other Hearts do not listen turning it into a competition on who can get rid of the monsters the quickest. Purple Heart comes in last in the competition. After eliminating the monsters wires pop up and bind the Hearts.
Arfoire and Warechu appear and throw red crystals revealed to be anti-crystals at the Hearts. They form a tetrahedral shaped prison. The Hearts feel weakened as the wires constrict them further. Purple Heart suspects that the crystal is responsible and throws her sword at the crystal attempting to destroy it. The sword disappears as Arfoire reveals the anti-crystals cuts the ties between the CPUs and their Share Crystals. Warechu takes pictures of the Goddesses with the intention of spreading them throughout the internet to crash their shares. Neptune and the Goddesses can only struggle.
The Resolve (Turn) of the Younger Sisters
Eventually the Goddesses revert to their human form. Neptune notices Nepgear arriving to see Neptune in a bind. Neptune and the other CPUs remained trapped by Arfoire. Neptune complains about her boredom. Neptune also calls her various names mispronouncing Arfoire. Neptune wants to play some games asking Arfoire for games. Arfoire ignores her.
Neptune also thinks Nepgear does not have it in her to fight Arfoire. Vert tells her to believe in their sisters.
The Resonance (Limit Break) of the Goddesses
Neptune and the other Goddesses are trapped in the prison. Anti-energy starts to overflow and attempts to kill the Goddess. Neptune and the Goddess hold hands to resist the anti-energy. Their belief in each other transforms in share energy which starts to resonate. This provides the hope the sisters need to rescue them. Neptune gives Nepgear a long-deserved hug.
Planeptune's shares did not crash too much due to low amount of expectations people had of Neptune in the first place. Afterwards Neptune decides to have a picnic with Compa, IF and Nepgear because she wants to live her life to her fullest. Peashy appears, surprising the picnicking group as she recognizes IF and Compa.
The Secret (Your-Eyes-Only) of Lastation
Neptune and her Basilicom have taken Peashy in for about three weeks now. Neptune tries to play on her games but Peashy, wanting to play with Neptune pulls and destroys the power plug. Neptune chases Peashy around before being tackled by Peashy.
Neptune then complains to Vert about coming over too often to bond with Nepgear in a "sisterly way". Vert says she has something for Neptune which she assumes to be Vert's attempt to seduce her like Nepgear. Vert clarifies that Blanc has contacted Neptune.
Blanc contacts Neptune and she heads to Lastation to discuss a security breach. She lands on Noire after being distracted by Peashy reverting her transformation. Neptune joins the other Goddesses in tracking down the hacker after Zilge pinpoints the location of the hacker.
They find the hacker in his hideout. He reveals himself as "Anny" (Anonydeath) then reveals his collection of Noire pictures through many monitors. Neptune comments how cute Noire looks her cosplay. Anonydeath tries to escape using his monitors to attack the Goddesses. He is stopped by the CPU Candidates and Peashy while the Goddesses catch up to him.
Returning back to Lastation's Basilicom, a girl lands on Noire. When everyone asks who she is? She replies she is Plutia, the CPU of Planeptune.
The Fruits (Deep Purple) of Revenge
Neptune and her friends has dinner with the newly arrived Plutia. When Compa toast to the new CPU of Planeptune, Neptune complains about how it sounds like Plutia is replacing Neptune. Peashy snipes Neptune's meat and Compa offers eggplant as a substitute. Neptune says complains about her hatred of eggplants. She says that eggplants drains her strength. Arfoire and Warechu overheard Neptune's "weakness" about eggplants. Histoire tries to lecture Neptune on being picky about food but is interrupted by her suddenly ringing like a telephone.
Histoire and her Ultra Dimension counterpart discuss Plutia coming over to retrieved a large spike of energy that left her dimension. Meanwhile, Compa distributes pudding as dessert. Peashy takes Neptune's pudding. When they eat their pudding, Peashy splatters her pudding, as Neptune laughs, Peashy punches her.
Histoire relays her message to everyone as they should vigilant for a large energy source. IF decides to bring Compa out for work and patrol about the energy source. Everyone else stays in the Basilicom, relaxing. Plutia makes a Neptune doll. Plutia says she'll make Peashy and Nepgear one too. During the process of starting to make a Peashy doll, she falls asleep. Peashy also grows sleepy.
Nepgear rushes to a sleeping Neptune to show her a picture of a captured IF tied up on a pole, she received in her N-Gear. Attached with the picture is a map. Neptune and Nepgear transform, bring Plutia along and follow the map to rescue their friends.
They arrive at an eggplant farm run by Arfoire. Neptune demands the release of IF. Arfoire sends out eggplant monsters to attack. Neptune cannot bear to smell the eggplants and her transformation ends causing Nepgear to be unable to fall as she cannot carry both Plutia and Neptune.
The monsters cause trouble to Nepgear with Neptune unable to support her. Plutia becomes irritated smashing her Neptune doll to the ground. Plutia transforms into her HDD form, Iris Heart attacks Arfoire. During this Neptune decides to stop running and clear the monsters. Nepgear rescues IF. Arfoire then combines herself with eggplants to become "Eggfoire". Due to the fact that she no longers looks like an eggplant, Neptune is able to fight without a problem and Arfoire is defeated by the Planeptune Goddesses. Plutia then saves Compa from Warechu.
When they return Neptune promises to not allow a certain someone to transform too often. She also is pleased to have another person hate eggplants, IF.
The Paradise (Island) Forbidden
Peashy attempts to steal Neptune's pudding with her name on it. She accidentally spills it and Neptune snaps at her saying she does not like her behavior and hates her. Peashy runs away unhappy and crying. The Goddesses appear behind Neptune saying Neptune is being the "bad guy". Vert then explain that they need to explore R-18 island to find an artillery battery.
All The CPUs and Nepgear transform to their HDD and fly over there. They also carry Plutia with them. Meanwhile back in Planeptune, Peashy carries a Neptune doll and claims to be looking for someone. IF assumes it to be Neptune and Peashy wants to apologize.
In R-18 island, the Goddesses have to stay in their swimsuits due the dress code. After entering they run into Linda. She claims to be a reformed citizen and she offers to guide the Goddesses around. There, they find a beach where mysterious light grass seem to cover the private parts of people. Neptune decides to strip and play on the beach. Eventually, Nepgear, Plutia and Vert join in the fun. Neptune attempts to convince Noire and Blanc to join through the grass at the former. Blanc suspects something and uses her hammer to create wind to blow the grass away revealing that Neptune had her swimsuit and was fooling the two all along. Noire questions how Neptune was able to strip and Neptune says it was all a mirage. Nepgear however, did actually strip and accuses Neptune of tricking her.
The Goddess continue to have at the beach. Neptune and Noire have a game of beach volleyball. Plutia builds a giant sand version of a Neptune doll. Eventually Linda offers the Goddess an iced drink. Neptune takes it and becomes all embarrassed and shy. Plutia straightens Linda out and they continue their investigation of the island. Eventually the drink wears out and Neptune returns to normal.
Neptune says she does not remember what happened after the drink and Plutia remarks Neptune was very cute sending shivers down Neptune's spine. They find the artillery battery which seems to prepare to fire. It fires bubbles and a party begins. After a fun day at the beach, Neptune returns with souvenits and a batch of pudding with names labeled on it to resolve the morning's pudding problem. She is sad to find out that Peashy has left with her parents.
The Challenge (Rebellion) of Eden
Neptune tries to wake Plutia for patrol to find the energy source Histoire was looking for. She is still tired and throws her pillow knocking over a Peashy doll. Neptune sadly picks it back up and begins her patrol with Nepgear and Plutia.
Neptune, transformed to her HDD, spots a pack of wolves and decides attack them before any harm can be done to citizens. Nepgear argues, they are so far from Planeptune so it would not matter. Neptune attacks the wolves and gets annoyed that Plutia is not helping. Plutia gets mad transforms and scares the wolves away.
Neptune reverts back and tries does not want to fight Plutia. Neptune begs her to stay her friend to which Plutia says, there is someone else is worried about. Neptune realizes she should have spent more time with Peashy and apologized to her.
Nepgear receives a message from Histoire through her N-Gear. A new nation has emerged from R-18 island. The CPUs and Nepgear are sent to investigate. When they arrive the artillery battery points at them. Anonydeath welcomes them to their new nation Eden.
Noire intends to arrest Anonydeath but is stopped by the arrival of yellow haired girl in a white suit landing on her. The girl introduces herself as Yellow Heart She states she will defend her parents against anyone who attacks them.
After the CPUs manage to defeat Yellow Heart, she reverts to reveal herself as Peashy. Neptune demands to know what they did to Peashy as she does not seem to remember the Goddesses. Anonydeath ignores her and Rei Ryghts reads out Eden's demands to able to export their adult products to all nations and failure to comply leads to a declaration of war.
The Battlefront (Conflict) of Oblivion
Neptune is in her room moping with a Peashy as Nepgear announces she is going to head out. Eden has invaded Planeptune with Neptune unable to bring herself to stop Peashy. Plutia and Compa are concerned about Neptune.
Histoire is alerted that Peashy is the huge power source they were looking for. They need to stop her or else the world of the other Histoire will unravel. They also note, that must be why Peashy knows IF and Compa as she came from the other Histoire's world.
Neptune continues to sit with her Peashy doll as Compa gets a call from Neptune's N-Gear. Since Neptune does not want to answer it, Compa puts the device next to Neptune's ears. Noire yells at Neptune telling her to get a grip and stop Peashy. Neptune, however cannot bring herself to fight Peashy and the call ends. Plutia says she does not have to do anything and that they can play games. Neptune then tells her she cannot do that as nothing gets done and so she resolves to stop Peashy.
Nepgear is losing the battle against Eden's forces and Peashy. Neptune flies to save her and decides to stop Peashy. She stops her transformation and grabs Peashy. Peashy struggles to get Neptune off her as Neptune declares she will never let go.
Eventually due to the work of Noire and Plutia at R-18 island, Peahsy's transformation ends and the Eden's forces stop invading. Neptune clings to a falling Peashy who states she hates Neptune. Neptune says she does not care as long as Peashy is fine. They plummet into a river.
To fix the other world's unraveling problem, Plutia and Peashy return to their dimension. Peashy does not remember any of the Goddesses or friends despite the destruction of the device that powered Eden. Neptune arrives to group's farewell with a Peashy and Plutia. Neptune gives Plutia a hug and Peashy her pudding saying it is the best pudding. Neptune notices before Peashy leaves, she recognizes the pudding and seems to remember Neptune. Neptune is the last to leave in the group that sees her off. Neptune then cleans up her room to find a picture drawn by Peashy about Neptune and her sharing pudding and sheds a few tears.
The Emissary (Aggressor) of Old
Planeptune's shares have been on the rise recently. Histoire notes it is too drastic of a change even if Planeptune was able to stop Eden's army. Neptune says when she is serious, she can work miracles. Neptune wants to host celebrations on her Basilicom grounds to thank her citizens.
Later in Lastation's Basilicom she invites the other Goddesses. They all reject as Vert explains how insincere it was of her to host a party after all the Goddesses shares having been dropping. Neptune manages to give Noire tickets in case she wants to show up.
Neptune and Nepgear work on the festival and they meet Abnes who they both do not remember. She volunteer Abnes to help Nepgear with the preparations. Neptune then recieves a call from Blanc asking her to meet in a forest. Neptune wonders if Blanc wants to come to her fair so she meets her in the rendezvous point.
Blanc, transformed attacks Neptune who wonders what the problem is. Before the two can get into a serious fight, Rom and Ram stop Blanc defending Neptune telling her to believe in their friendship. Blanc stops and warns if things continue as they are, there will be war between the two nations.
The festival opens and people begin to have fun. Histoire praises Neptune for her work. Suddenly the clouds darken as a landmass rises. Rei Ryghts transforms into her CPU from and announces Tari has returned. Neptune arrives and asks her who she is and what she wants. Rei Ryghts wants Planeptune and their inhabitants to serve her. She has ruled over the land longer and wants the land.
Neptune refuses and Rei aims a laser at the Basilicom. She splits it in half while cutting contact from the outside world preventing the other Goddesses from helping her. Neptune still resolves to stop her and protect her citizens.
The Ties (Bifrosts) of Tomorrow
Neptune tries to stop Rei Ryghts but is completely outmatched. As Rei charges her laser, Neptune attempts to intercept it to be struck and stunned by Rei Ryghts' lightning. Meanwhile, Nepgear tries to evacuate people to safer ground. She is captured and the Planeptune's citizens begin to lose hope. Nepgear cannot transform due to lack of shares. Rei continues to steal Planeptune's shares and all seems lost.
Suddenly Vert, Noire and Uni arrive to save Neptune. 5pb. also arrives provides moral support. The four claimed to have arrived for the carnival. They try to stop the laser by breaking the share stealing device but are unable to. The laser is fired at the Planeptune's civilians. An iceberg appears to reflect the laser. An axe is thrown destroying the share stealing device.
Blanc has arrived to help the Goddesses. Nepgear transforms and also tries to stop Rei Ryghts. The Goddesses are able to prevent her from firing a pong laser. The Goddesses stop manage to distract Rei and launch Neptune at the floating landmass allowing her to destroy it with a Victory Slash.
Rei Ryghts then tries to take the world down by blowing up and the Goddesses surround her blocking her. They contain the explosion from Rei Ryghts but they are all knocked out. Neptune manages to awaken to see Arfoire use her last anti-crystal to destroy Rei Ryghts' share crystal ending her powers. Neptune thanks Arfoire but misprounces her name as "Arwhore". Arfoire is comically enraged as she leaves.
The Goddesses appear in their formal dresses months later as Planeptune is getting reconstructed. Blanc apolgizes to Neptune over the forest fight. Neptune says that it was actually fun and has an idea. During a ceremony that parallels the friendship treaty signing, Neptune reverts to her human form. She tears up the friendship treaty because they are true friends now. They then host an exhibition match. Neptune is the last of the Goddesses to join in. Their sisters join in as well as the sky lights up in the colors of the Goddesses.
The Eternity (True Ending) Promised
Neptune tells Nepgear she has to kill her to save Gamindustri. Nepgear tearingly slays Neptune who then transforms in a bunch of Dogoos and overwhelm her. Nepgear is having a nightmare with Neptune discussing to the other Goddesses about their sisters' nightmares.
The sisters are afflicted with Bad End Syndrome. Histoire remembers the condition afflicting a Goddess 3 generations back. Histoire states they need a Walkthrough Flower which they need to boil and give to their sisters. Blanc and Noire search the caves near the Lowee-Lastation border. Neptune and Vert hand to the Ultradimension thanks to Histoire's ability to open dimensional portals.
Neptune and Vert cannot fly since they cannot activate their HDD in Plutia's world. Neptune lands on the Ultradimension Noire. Vert notices the other counterparts. They also spot Plutia. Neptune notes that the Ultradimension Goddesses are the same in looks and personality to the Hyperdimension Goddesses. Neptune meets Peashy who tackles her down. Peashy notes that Neptune is weak while she notes that Peashy made a full recovery.
The Goddesses and Histoire head to The Cursed Hell Devil Death Bloody Spectral Tower. Histoire tells them they have 3 hours to recovery the Walkthrough Flower. Since Neptune and Vert cannot transform, the Ultradimension Goddesses decide to help them out.
They ride up from the 4th floor to the 9999th floor takine 2 and a half hour. There monsters attack and the Ultradimension Goddesses stop them as Vert, Neptune and Peashy reach the 10000th floor. The three split up and Neptune finds the Walkthrough Flower.
A monster attacks and Neptune runs meeting up with Vert and they continue to run. More monsters corner the two and Peashy transforms to save them. Neptune and Vert make for the exit. Peashy has trouble with the monsters so Neptune hands the flowers to Vert and decides to stay behind despite the time ticking down to return. Neptune and Peashy manage to defeat the monsters but the time has run out.
Peashy asks Neptune why she wanted to stay behind. Neptune states it was to help Peashy and fight with her as an ally. The Ultradimension Goddesses make it up and asks what Neptune will do now as she is stuck. Neptune says it is find due her protagonist status and will return to the Basilicom first. The Warp Gate malfunctions opens a portal between the Lowee/Lastation in the Hyperdimension with the Ultradimension.
Neptune is then seen in her Basilicom with Compa, IF and Plutia. Peashy steals Nepgear's N-Gear as Nepgear chases her. IF asks if the portal from malfunction gate is still open. Neptune says it is and the other Goddesses are seen interacting with their Ultradimension counterparts.