Board Thread:Wiki Discussion/@comment-81.105.245.34-20160703183027/@comment-26561761-20160703190928

In order to use any fighter in battles besides Fallout Boy, Pie Man and Clownface you require to have the character or skin unlocked and completed Inch by Inch Pt. 1 that all.

If that's not working for you, try to synchronize the game by going to your friends' screen or krustyland. Other than that you'll need to contact EA.