The Cat is a god-like entity who works with The Axolotl in the Gravity Falls universe, they represent protection and acceptance. They are the more serious amongst The Axolotl’s group, aside from the Axolotl themself of course.

they’re a giant talking cat, Mabel would be over the moon for this guy
this is only the beginning of me finishing up the animal god sketches i made last week

Gravity Falls ©️ Alex Hirsch / Disney