Callisto

Jupiter is good. He is her father. She respects him and considers him very wise and well-read. She is faithful to him as a companion and is loved by him as a daughter. In general, Callisto has a good relationship with Jupiter.

Stone planets—Callisto doesn't really know the stone planets well; she's never really been there. She only knows their approximate character and appearance.

Earth—Earth is an exception to the rule. Callisto knows him, but they are not friends. She is more his protector, since Europa and Ganymede wanted to destroy all life on Earth. Callisto acted very nobly in that moment. But generally, she treats him no better than anyone else, even the opposite, due to his past statements like "Moons should know their place."

Saturn is neutral. She knows that her dad is very jealous of Saturn and she even feels sorry for Jupiter. Callisto believes Saturn lives a false, idealistic life and that everything in the hundreds is a lie. She views him skeptically because of his stupidity and forgetfulness. But she wouldn't say such a thing to him.

Uranus is neutral, more bad than good. She remembered how he threatened his satellites and generally behaved a little ridiculously. Callisto treats him with respect; he is a planet, after all, and nothing more.

Neptune—Callisto surprisingly treats Neptune with silent respect and fear. First, he is Triton's father, and second, he is crazy and not to blame for his behavior. She loves him, but sometimes, according to her, he goes too far.

In general, Callisto treats all planets with neutrality. Of course she loves them, but she will never say it.

Her family is quite well-off. They have a large two-story house with two bathrooms and separate rooms for the four eldest: Ganymede, Callisto, Io, and Europa. Callisto is used to wealth, so she feels a little awkward when she learns how poor Triton actually lives. Callisto is very grateful to Jupiter for the childhood he gave them.

Callisto was born a fairly ordinary child. She had some extra weight until she started growing weak and eventually became very thin. Now, at 19, she has a decent figure, but she still has issues with vitamins and self-acceptance. She used to play piano — not a master, but not bad either. She took lessons with tutors, but she wasn't progressing as fast as she wanted, so she quit. She still likes playing piano, but if anyone tells her she's bad or good, she'll just brush it off with "Ah, I don't play."
Callisto was always a quiet and detached child. She got along with her siblings somewhat, yet a smile was a rare sight. In her teens, around 16–17, Callisto suffered from depression. Her lowest point was at 16, when she didn't get out of bed for months and literally began to rot. Now, at 19, she feels better, but she recalls that period with a shudder. At 14–15, she was an anime fan. She even had a favorite character. She loved him so much that she cut out a life-sized cardboard figure of him. Later she got embarrassed and still hides it in her closet. Callisto doesn't like bright colors. She lives almost in darkness — the only lights in her room are fairy lights on the wall above her bed and her laptop. Her relatives joke that she's a vampire, and she's flattered by that.
She also likes it when people worry about her. She even sort of enjoys having anemia because people fuss over her and ask how she's feeling. Callisto loves that attention, but she's ashamed of having those thoughts.

Callisto is fairly fearless, but she is afraid of space rats, dying without having written a song, becoming a nobody, being stupid, loneliness, returning to that terrible period of her life when she started rotting away. She's afraid of fainting in an ugly way. She's afraid that if she gets lost, no one will come looking.

Her day starts with waking up at 8 AM and staying in bed until 9 AM, so no one bothers her and she can eavesdrop on what her relatives are saying when they think she can't hear.
After that, she goes to the kitchen and has breakfast at the huge table — one of various breakfast options (Jupiter serves them different kinds, from porridge to toast). Callisto's favorite is toast with cheese and egg.
Then she goes to watch over the younger ones, depending on whose turn it is. She's not the most honest babysitter — she just sits in their room listening to music rather than actually watching them. After that, she heads to her garden to tidy up or plant roses. Alternatively, she goes out with friends or stays in her room. Her schedule isn't very exciting because she's generally a low-energy person — her insomnia and anemia prevent her from being active. Her fragile mental state and the depression she's still recovering from also hold her back. She doesn't have a job. She prefers a sedentary lifestyle. When she comes home, she grabs her laptop and may start writing articles, study, or play dating sims (until 4 AM, when she finally falls asleep).
Sometimes her schedule includes lessons from Jupiter, where he shares his wisdom and knowledge. That's where she gets her intelligence and erudition — this is also how she knows about Triton (and his former status as a dwarf planet/drifter/adoptee).

· Luna — Callisto is on friendly terms with Luna. She helped Luna during the Lunar Revolution and considers him a completely harmless being she wouldn't want to hurt.
· Triton — Best friend (romantic interest, though Callisto hasn't admitted it yet). Callisto and Triton have a very good relationship. Triton respects her bluntness, and he taught her not to care about others' opinions if you like living that way. They often hang out, and Triton gives her rides on his motorcycle. She helps him with shopping (sometimes dressing him in ridiculous outfits, and he wears them because he trusts her). In his company, Callisto softens a little and can even laugh. She sometimes visibly gets flustered around him (which is very unlike her). She thinks Triton is a cool self-taught biker. Honestly, she admires him for his hard work and ability to stay sane amid crazy kids (his younger siblings) and a crazy Neptune (his adoptive dad).
· As for the rest of the Solar System — she doesn't care. They aren't particularly close due to Callisto's reserved nature.

· Jupiter — Father. Callisto greatly respects and obeys him. Their relationship isn't particularly affectionate, but Callisto genuinely worries about her father and helps him when needed.
· Io — Best friend and brother. Callisto has known him for a long time, and they are very close (unlike with the others). Io is autistic. Everyone has come to accept his quirks and emotionality. Callisto takes care of him.
· Europa — Younger, annoying sister. During the Satellite Revolution, Callisto was on bad terms with her, openly hostile even, but they've since made up. Callisto looks after her, though Europa can be quite tiresome. In Callisto's opinion, Europa is mischievous, sometimes exaggerates, loves to talk about herself, and makes up lies (like that Callisto loves Triton — Europa is right).
· Ganymede — Older brother. Similar dynamic to Europa, but even harsher. They're still not on the friendliest terms, but they do love each other (as siblings do). Ganymede is constantly overprotective of Callisto and considers Triton unworthy of his sister (hence he keeps testing him). Callisto finds this extremely annoying, so she hides her meetings with Triton (Triton doesn't mind).
· Other younger moons: neutral. Callisto just keeps an eye on them. If they go missing… well, Callisto would worry, but she probably wouldn't notice at first.

One of the most pragmatic and gloomiest moons in the Solar System. She has a melancholic and perpetually sullen demeanor, emphasized by dark circles under her eyes. She completely doesn't understand or accept jokes, communicating dryly and to the point — which once prompted Europa to directly note that Callisto doesn't know how to have fun.
Most often, Callisto can be seen with Io. At first, his habits drove her crazy: his constant snap judgments, panicking, and endlessly "coughing" sulfur dioxide from his volcanic activity. She openly considered him odd, but over time her irritation faded. Eventually, they became close friends, and Callisto even admitted that although Io is "not exactly normal," he's actually awesome.
Despite her outward coldness, Callisto has a strong moral compass. She genuinely cares about the safety of others.
Callisto is highly erudite and observant. She is well-versed in the structure of space — for example, she knows how few moons have a perfect spherical shape. It was her strategic mind that helped figure out how to defeat Ceres and prove that it was a dwarf planet, not a full-fledged threat.
Callisto speaks in a very monotone and emotionless way (with non-close people; with close ones, she speaks more clearly).
Callisto very rarely shows any emotion — even Triton is surprised when Callisto actually laughs.

Clothing (at home): At home, she prefers to wear an oversized t-shirt and leggings (but if someone comes over, she immediately changes because she's self-conscious about how her legs look in them), barefoot or wearing thin striped socks.

Clothing (outside): Outside, she wears a large brown knitted cardigan with pins and a dark bag with a keychain — a tiny jar with stars and glitter. On her legs: two pairs of ripped tights, platform shoes, and a black skirt.

Appearance: Callisto looks like a human with very dark purple skin marked with craters, yellow eyes, and long, straight hair with metallic threads. She resembles a starry sky.

· Name: Callisto
· Gender: Female
· Age: 19 (in human years), 4.5 billion years (actual)
· Birthday: January 7
· Zodiac Sign: Capricorn
· Residence: Jupiter's house (she lives there with Jupiter's other moons)
· Frequent Locations: home, Lunar Club meetings (in the asteroid belt, featuring a large abandoned house on the street between Jupiter's and Mars's houses), personal garden
· Hobbies: journalism (writes news articles), cardboard crafts (steals boxes from stores but is too shy to ask), gardening (grows flowers in her garden), plays The Vampire Diaries (allegedly as a joke, but if you delete it she'll get angry), fan of weird manga/manhwa, used to watch anime, piano (abandoned because she's afraid she's too untalented to call it a hobby).
· Unique Traits: very beautiful, completely emotionless and logical. One of the largest moons in the Solar System and of Jupiter.