Man, all of those films have some serious problems: KJ=insipid, with the only good Kangaroo scene a dream sequence, like the good scene from "Snowdogs"; WoV=booring, kiddy-flick-- but at least they tried*; Tank Girl: pretty good, actually...but the whole film should have been animated; Matilda=uh.
I'm assuming you're only including live-action films. Which should include "Joey" (eh, live action, with a real kangaroo) and "Me and You, Kangaroo"-- another boy-raises-kangaroo film ("eh").
If you're talking great kangaroo costumes, you forgot "Storybook" (aka, "the Enchanted Attic"), a kid-fantasy film with a pretty neat kangaroo character and a giant snake:
Storybook's kangaroo character costume is a great design, though his name is "Pouch", despite the costume being a correctly pouchless male. The movement of the tail and body of the costume is fantastic!
*And don't get me started on WoV2: ACK!! No kangaroos whatsoever! After you spend a huge chunk of the film wondering where the hell the kangaroos are, they finally explain that they were "transformed" into humans! Money back, plz!