Tuffy, also known as Nibbles is the deuteragonist of animated series Tom and Jerry. He is Jerry's nephew. Like his uncle, Tuffy can either be seen as playing pranks on Tom or get chased by him even in return, but like his uncle, Tuffy and Tom sometimes have a good relationship. Tuffy is very mischievous and is constantly causing trouble, which annoys the other characters, especially his uncle. He also is Tyke's best friend.
He sometimes can be antagonist.
Tom and Jerry: The Magic Ring
He is a mouse tormented by two other mice Freddie and Joey
Tom and Jerry: A Nutcracker Tale
Tuffy serves as Jerry's companion on a quest to find the toymaker after the cats, lead by Tom abduct the Music Box ballerina and take over the kingdom in the film
Tom and Jerry Meet Sherlock Holmes
He is a church mouse
Tom and Jerry & the Wizard of Oz
He is a munchkin who desires the height
Tom and Jerry's Giant Adventure
He is a very big mouse, much to Tom's shock and surprise
Tom and Jerry: Back to Oz
He was locked in a cage by the Nome King
Tom and Jerry: Willy Wonka and the Chocolate Factory
He is a Oompa Loompa "intern".