1. Mega Man (Mega Man franchise)
This one’s a no-brainer. Although Mega Man is Capcom’s mascot, the Blue Bomber has been on Nintendo systems since the early days of the NES. His well-known power-stealing abilities could make for some interesting Kirby-style gameplay as he snags abilities from other characters. And considering the fact that Mega Man fans haven’t had much to look forward to lately, the little bot’s inclusion might help ease the ongoing pain of Mega Man Legends 3‘s cancellation.
(Mega Man X would also work just fine, since they’d functionally be the same character – maybe an alternate fighter skin would be appropriate.)