Original unmodified version of Shazzo's Mario. Originally made for never finished "Super Mugen Bros.", but erroneously called "SMBZ" characters (they have nothing common with the actual sprite animation itself, you guys better read the readme file). Like all of Shazzo's characters, this Mario is based on Actarus' "CvS" Axel Stone but the moveset is different from his base so he's not exactly a spriteswap.
The "MarioSMB_old" archive is the version of that character I found in the so called "mugen mario bros. z mugen character pack" (sic), having slightly different animations (and lack of intro and win pose animations), while "MarioSMB" archive is what I found in "backup" archive in Shazzo's Boo (with mugshot, portrait, and name restored by myself), hinting at the fact that all Super Mugen Bros. characters were made using Mario as base.