Well my thought is that he was a Lion in Pride Rock, makes One. Then he was half Shark in Atlantica, i count that as number 2.
Now it gets tricky. So we could argue, that Sora is somehow a Bat in Halloween Town, because he turns into a Vampire.
Then he could count as what ever he resembles in Monster Inc., a Cat maybe? So we could count that as 4 in total?