Garakuta Studio's Graffiti Kingdom allows players to make their own 3D characters for use in a platforming adventure. Someone went to the trouble of making a Mario that is almost dead-on. We say "almost" because the movements are slightly weird, but for something made in-game this is quite an achievement. It's good enough for a Graffiti Kingdom character, right? Check out the video of "Mario" doing some adventuring and some basically 3D Mario moves after the break.
And while we're talking about Graffiti Kingdom, we can't help but link to these fanmade versions of the King of All Cosmos and a weirdly accurate Razor Ramon HG-- how disturbing, as the King would say.