Ok first off Wart is the main villain of SMB 2, which is already a plus since Brawl lacks villains as of now. Wart is also way more retro than Geno, another plus. Wart is first party, which means no SE to deal with. Yet another plus. Oh and Super Mario Bros. 2 was the third highest selling game on the NES with over 10 million copies sold to SMRPG's 2 million I think it was? Needless to say, SMB 2 is way more well known than SMRPG. As for being more unique than Wart? I'd say thats one edge Geno has over him. Wart was a pretty unique fellow for his time though. A King of Dedede proportions spraying bubbles? No doubt a moveset could be worked out for him. Bowser started off with just his fire breath attack anyway.Uhhh I like Wart n all but wan't he only in one game too? And out of all the Mario games isn't this the least of the NES, SNES collection. I mean we can all agree Mario bros. Mario 3, Super Mario World, Yoshi's Island are way more popular than Mario Bros. 2 and Super Mario RPG just may be more popular than Mario Bros. 2. Also it's very clear to see that Geno is way more popualr and would probably be a lot more unique than Wart. But again I'm not attacking Wart cuz I'd like him to be in but just don't see it happening in Brawl. Maybe the next one. For now Wart as an AT or Subspace boss.