Stitch

Stitch is a freakish yet adorably cute alien genetic experiment that originated from an unknown sector of space. He landed on Earth and befriended a girl there named Lilo, and took time in rehabilitation to shed his natural instinct to destroy.

He is now a loving, caring and fully capable member of society and holds a rank in the League military. He still visits Earth from time to time, to see his friends.

He can disguise himself as a dog (or something that looks vaguely like a dog) by retracting his two extra arms and his antenna. Weird.