Slinky

"Gotta say it two more times, Annie."

Slinky is a Guardian, a creature assigned to a specific person, known as a Ward, on their 16th birthday to bond with and protect them.
He's a shapeshifter, able to warp and change his form into whatever he wants, though he'll retain his original colours and patterns (as in, he can't change his stripes to other patterns; he's able to shift them around, however). He's 6 feet tall in his resting form, and is able to change his size to seemingly no extent.

Slinky is very friendly and sociable, and is quite the chatterbox; he can ramble on and on about whatever he has on his mind if you let him. He's extremely high-energy and hyperactive, and can get fidgety if he has to stay still for prolonged periods of time.
Slinky can be rather childish, usually not taking anything seriously unless he's told off or his Ward is in danger. He's also quite sensitive, despite his overly optimistic demeanor, and it's pretty easy to hurt his feelings to the point of tears.
Slinky has formed a super-tight bond with his Ward Analise, and he's very protective of her and can get a bit clingy towards her, to the point of getting anxious if he's separated from her for a long time. He's super affectionate, especially towards Annie; even in public areas, he isn't afraid to sneak up on her and pull her into a playfully aggressive death hug-- even if it's embarrassing to her. He doesn't really mean to embarrass her, though; he just wants to show her how much he loves her.
Voice: https://www.youtube.com/watch?v=nA94T6JLd34

Other facts:
-Aroace
-Has no bones or organs. The entire internal structure of his body is composed of some sort of gelatinous, rubbery substance.
-Usually only responds when Annie calls his name 3 times (he loves Beetlejuice and is aware of his resemblance to the character)