#ponies!

Party Poison : yellow coat with a bright red mane. unicorn- broken horn, bat pony ears maybe? (their dead pegasus jacket has a second meaning now lmao)

Kobra Kid : red coat with a black-and-bleach-blond mane. pegasus- probably bleached some of his feathers on accident

Fun Ghoul : green coat with a black mane- has pale markings on his front legs that he dyes yellow for fun. earth pony. most trigger-happy of the fab 4 and has to be physically removed from fights sometimes so he doesn't accidentally hurt himself

Jet Star : blue coat with a brown mane. unicorn- electric blue magic aura. special talent is making star-shaped explosives :)

just for funsies:

The Girl (probably referred to as The Filly) : pink coat with a brown mane with blue stripes. unicorn (but turns into an alicorn later on). no cutie mark until she raises Destroya, then it's a battery with a digital clock set into it (time would read 00:01)

I have no fucking clue what Jonny is, but he doesn't have a cutie mark and kinda doesn't want one at this point. he's gonna have fluffy ears and a tail that has a rattle hidden in the floof. he still plays harmonica. don't ask me how, i beg.

Marius is a changeling who lost one of his front legs and a significant chunk of his memory, so he doesn't even remember that he's a changeling. he is always so hungry.

Brian and the Toy Soldier are both automatons, but TS has the abilities of a changeling. how? why? i don't know! neither does it! it draws its own cutie mark on with markers. it never draws the same cutie mark twice. Brian is made of metal and still has the morality switch. instead of a cutie mark, he has his name engraved on his flank.

Ivy is a unicorn and is always learning new things. she also tries to learn as much non-pony magic as possible.