Neptune is the main protagonist in Hyperdimension Neptunia anime and games.
Neptune is the human form of Purple Heart, the CPU of Planeptune. She loses her memory after a terrible fight and is banished to Gamindustri. After crash landing, Neptune finds herself in the home of the nurse in training, Compa. Now she must try to rally the other Goddesses and fellow party members to come aid her in defeating the evil goddess, Arfoire.
Neptune is the older sister of Nepgear. In mk2, she is captured along with Blanc, Vert, and Noire, so their sisters must step up and rescue them.
In the AWA fics, Neptune is a student at the AWA Academy and is a part of Class 23.
Neptune is a fair skinned girl with light purple eyes and a matching shade of hair. It's shoulder length with somewhat messy bangs with many strands sticking up and few framing her face. She wears two gamepad-shaped hairclips. Originally Neptune's measurements were 73b, 54w, and 76h. She is 146 cm (4 feet 9.5 inches) tall and weighs 37 kg (82 pounds). In mk2, Neptune has gained a little bit of weight.
Originally Neptune wore a big white hoodie-like dress with purple striped cuffs, lining, and a purple hood. The outfit had pale, ice blue and light lilac accents. As well as a zipper section, two big round pockets, a big zipper with an N on it, and strings resembling a plug. Around her neck she wore a simple white choker. Her lilac shoes have blue and white accents and were also worn with blue and white striped stockings. When revealed, her under garments consists of blue and white stripes.
Out of the four main Goddesses, Neptune is the most careless and carefree. She'll jump head first into any dangerous situation without consideration, and she does not bother to think about the possible consequences that await. Several characters, including her own friends, see Neptune as stupid and somewhat crazy, due to coming off as a clueless airhead with a tendency of asking random questions or getting shocking ideas and theories. Neptune hates horses, cows, sheep, and ponies.
Besides that, Neptune is easily surprised and has shown klutzy tendencies. She usually shows an eager and perky behavior and is very affectionate to generally anyone, to the point of giving them cute nicknames or refusing to give them their personal space. She even does things such as tickling girls, hugging them, or even touching their breasts. Noire is her common target.
She also happens to really love food. Often in the middle of a snack or thinking about food, more-so in the Mangaand official artwork she can be seen eating every so often. She often receives comments from both friend and foe about her 'pudgy' physique.
At first, Neptune was uncaring for anything important and was very lazy and impatient. She soon learned however that it was important to protect everyone depending on them and made plenty of new friends.
In mk2, Neptune is still an airhead and pretty childish. But she's lost her attitude and impatient behavior and seems a little more mature and caring, and a little less selfish. She cares deeply for her little sister and tries to help with her confidence issues, and also happens to be very protective over Nepgear.
Her dungeon ability, "Hammer Crush" allows Neptune to break any obstacle in her path in order to continue exploring or come by special items. Her default weapon of choice is a sword in human form and an Ōdachi when in her HDD form.
- Neptune is the first character from Hyperdimension Neptunia to be introduced in the AWA fics.
- Neptune is the only one from the original Goddesses to not have a color for a name.
- Neptune and Planeptune's names are loosely based on the canceled Sega system, the Sega Neptune. The console referenced is a hypothetical successor to the Dreamcast. You can see the game's take in the intro for the first game, as well as the anime.
- Despite being called pudgy due to her eating habits, out of the four Hearts she ties with Blanc in terms of weight, though she is taller then her.
- Neptune plays video games, as stated during the "Lastation's Game Company" event.
- Neptune's normal form attire seemed to be based on a game controller.
- In the AWA fics, Neptune is currently the girlfriend of The Author.
- In the AWA fics, Neptune along with The Author adopted Rin from Shelter.