A nervous skinwalker akin to Animaniacs' Buttons or Scooby-Doo, who prefers staying in dog form and helping the twins out of trouble. Useless aside from getaway vehicle status.
I actually love self inserts okay. If you guys have GFalls self inserts you should tell me about them in the comments (i'm way behind in season 2 tho please spare me from spoilers). If you have self inserts that aren't GFalls that's cool too. Just do you and enjoy what you create.