I believe you should have a better story mode for season 3. And by that I mean, EVERY character from s1 s2 and s3 gets an ending after you beat their story instead of a specific season of characters. The one problem I had with Story mode for season 2 was the fact that the s1 characters were not playable in Rivals.
Only making the suggestion because I truly enjoyed playing regular arcade mode and when you beat the final boss, you get an ending. Pure simple.