-15minute brawl -Giant fights(hard and above) -All star mode(normal(for some characters) and above) -Boss rush on normal and above. Tabuu kicks my stuff on normal.
Ok I am thinking DM wise. There should be power ups that you can pickup and use for 15 seconds. Super speed, flying (for no jetpack DMs), Fireballs (more powerfull than flamethrower, and able to shoot the fire).
Also, if it is not in DM I think you shouldn't have a time limit