Monty the Mouth is the (former) secondary antagonist of Stuart Little and the secondary tritagonist of Stuart Little 2, Stuart Little: The Animated Series, and Stuart Little 3: Call of the Wild. He is Snowbell's best friend.
Monty is both nice and rude at times, but is mostly clueless. He is known for being a pretentious blabbermouth as he always spreads word about many things, such as Stuart having a "pet cat" in the first film (which he found hilarious). And he is also known as mischievous, offensive, naive, tenacious, clever, mild-mannered, outgoing, neurotic, timid and sneaky.
- Monty is sometimes thought to be the (former) main and tertiary antagonist of Stuart Little and the tritagonist of Stuart Little 2.