Mat is a ragged brown tom with dark brown eyes, and a long scar down his flank.
Mat was a kittypet, like Rug, and they grew up together.
Rug later left Twoleg-place when she was 10 moons old, without telling Mat.
He left to look for her.
When they met up again, they didn't reconize each other. But after they realized who they were, Mat asked Rug to be his mate and she agreed.
Mat is later killed protecting Paw from Naruto.