Spoken like someone who never watched the show and just parroted some of the info that article just gave you.

Morph was on a fair amount in the show and had his own arc. He was sort of based off Changeling from the comics, but was a different character completely, just with the same ability and created just for the show.

Also, Gambit wasn’t even in the movies. Jubilee also didn’t really have a roll in the movies, but Gambit, Morph, and Jubilee were all major characters in the cartoon.