Now fer the middleweights. At the top's Sophie "The Fighter", a cat. Sophie is Kathie's older sister. Was thinkin the cat sisters would usually be the main focus of a story, perhaps. Sophie's call by the nick cause she's willing to take on anyone in the ring, any male or female of any weight class. Her idea fer her outfit, is just to keep it simple.
At the bottom's Selene, a human. She's sorta a best friend and rival of Sophie, same height and nearly the same weight. Her outfit's pretty much taken after modern athelic's sportswear.