Yes, Mario RPG features Bowser as both a boss and a playable character. The first few times you meet him, he attacks Mario ...

From reoccurring bosses across titles ... her first appearance in Super Mario Bros 2, Birdo's gender has been quite controversial, as the instruction manual of the game mentioned that Birdo ...

The game in question is none other than Diddy Kong Racing, the 1997 hit from Rare that remains the only true kart-racing rival to Mario ... all of them culminating in some sort of boss race.