Character Design - Assignment 3: Protagonist

Here's my protagonist, based off my pet rat Nickel. Nickel was a rescue rat, destined to be snake food, but he was saved by Little Friends Rescue in Ontario and then adopted by us. He is a strange choice of protagonist because he is really mean to our other rat Chippy, but in my head it is just to protect his little brother, Rush (who you'll meet in assignment 4!)
Here is Nickel:
