Marvin Mouseton is one of the major characters in Spruce and Gimli.
Marvin appears in How to Care About a Rodent Who Suddenly Trespasses a Home that he befriends Gimli to help him get to his home.
Marvin is obviously a small anthropomorphic mouse with gray fur and green eyes. He wears a teal blue adventurer hat on his head, his prominent outfit is a teal blue adventure jacket, teal blue shorts, white stockings, and black laceless boots. As a mouse, Marvin have white buck teeth and whiskers.
Marvin seems to be adventurous, a little confidant, and a timid coward. He is simply obsessive to treasure and likes going on adventures.