Button is a yellow kitten appearing the episode, Smitten with the Kitten. Despite being a cat, she's actually friendly with Jerry and Spike, and she doesn't chase mice.
She is kind, polite, friendly and loves making friends. She is also very cute and everyone loves her (despite Tom disliked her at first).
She looks like a younger version of Toodles (only in the Tom and Jerry show) but with a yellow bow.