I know I've talked about Spike before, how they're not originally from the Bugsnax universe and stuff, but I wanted to give their Grumpus form a redesign :3
Spike is Demi-gender and Aroace, with They/It pronouns :33
Spike was found and adopted by Wambus and Triffany when they were just an egg after the two found their egg randomly (finding and adopting kids you find runs in the family ig)
Spike does know about their powers, shape-shifting, but from the stories they were told as a youngin by Triffany, never bothered to use them
Spike is actually 20 years old, which is a year younger than Filbo and extremely shy. They bond with Wambus a bit more after getting stuck on Snaktooth (after the events of main game) with the Bugsnax being more hostile.
( Chapter 5 spoilers so skip this if you haven't read it)
Spike feels terrible knowing they're the one who got Wambus infected by the Bugnsax after letting him fall into the Jam, thinking it was just the bugsnax pretending to be him and not actually Wambus. (Yes, Spike was the one pretending to be Lizbert and Eggabell)
They still don't trust themselves and are really hesitant around Grumps now after that. They only really talk with Wambus, and Triffan, and Filbo, and Floofty.
Spike used to be close with Beffica, but now they've noticed some things about her that make her seem a bit suspicious ever since returning to Snaktooth and have kept far away from her.