Not much is known about Monty, other than these things here:
Monty has some distinctive features about him, that makes him easy to tell apart from Mickey.
•Such features include: He has one blue eye, and one green eye, while Mickey has two blue eyes.
•His tail and head fluff are dyed blue, while Mickey's fur is all grey.
•He wears a yellow sweater, with a baseball cap, while Mickey only wears a music-note print collar.