I posted her first!
I'm just joking, 2/3 characters is about my limit, so even if Reinforce numero uno was allowed I'd cede the honour to someone who really wanted her :P
Especially if they're all playing the music, slightly out of sync and deafening in volume :PA mushroom kingdom counter-attack using mass invincibility stars would be hilarious, actually XD.Then suddenly a massive wave of Toads rushes from the castle, flashing yellow light. Oh god, that'd be horrifying for Bowser's troops.