..i might have based their colors around Snatcher from AHIT.
Name: Dark Spacial
Nicknames: Void
Gender: Technically female, sounds and acts like a male, and is genderless because they're a soul. so uhh, any pronouns fit here (though I use he/him or they/them)
Species: Dark Flareon (Spacial's soul)
Appearance: Very deep purple with grey fur for the neck collar, the tail, and the head fluff. The eyes, ears, and inside of their mouth is a yellow that glows in the dark.
Personality: Evil. They are basically the "dark" side of Spacial. They tend to be rude, make snarky comments, complain, and laugh at others failures. he does, however, sometimes share the same opinion with Spacial, and thus they can tolerate each other
Hobbies: Being evil, making fun of others, causing mayhem, and collecting souls
History: Was trapped inside Spacial's soul for a long time until they finally managed to escape. That's it.
Preferred Weapons: Claws, energy attacks (mostly darkness related), fire
Likes: doing the things listed in the "hobbies" section, especially collecting souls.
Dislikes: Spacial (for the most part), being stuck inside a jar for being bad, people who ruin his fun
Other notes: He mostly dwells either in his prison bottle of punishment or residing within Spacial's soul. If he is residing is Spacial, he can exit at any time. If outside, he can also re-enter. This has no harmful effects on Spacial or what is left of her soul (the good part) and in fact, Dark Spacial must be within Spacial for her to activate her "super form". He cannot, however control whether he is in the punishment bottle, and will get teleported in and out; it depends on the user's leisure. When appearing or disappearing from the room, they teleport with a cloud of shadows.