)
Not that I'll ever play a SMB past Brawl (so excuse me if this lists any characters that made it in post-Brawl), I've always had a shortlist of characters I would've loved to see (games and first Nintendo system appearance in parentheses):
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[Amaterasu":](https://en.wikipedia.org/wiki/Amaterasu_(%C5%8Ckami)) (Ōkami, Wii)
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[Bub/Bob":](https://en.wikipedia.org/wiki/Bubble_Bobble) (Bubble Bobble, NES)
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[Will/Freedan/Shadow":](https://en.wikipedia.org/wiki/Illusion_of_Gaia) (Illusion of Gaia/Time, SNES)
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[Vanessa Z. Schneider":](https://en.wikipedia.org/wiki/P.N.03) (P.N.03, GCN)
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[The Master/God":](https://en.wikipedia.org/wiki/ActRaiser) (ActRaiser, SNES)
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[Blazer":](https://en.wikipedia.org/wiki/Soul_Blazer) (Soul Blazer, SNES)
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[Mr. Diaz/Slater":](https://en.wikipedia.org/wiki/Hybrid_Heaven) (Hybrid Heaven, N64)
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[Duke Nukem":](https://en.wikipedia.org/wiki/Duke_Nukem_(character)) (Duke Nukem 64, N64)