I have seen 'Blackwolf the Dragon Master' for the past couple years at the comic conventions in the tri-state area.

This guy is ALWAYS in character. I'm pretty sure he actually believes he really is who he says he is.

From Wikipedia.org

'Blackwolf the Dragonmastercreated and performed by Richard Washington, is the self-proclaimed Unofficial Wizard of New York City. Notorious for his now-legendary unexpected encounter with Triumph, the Insult Comic Dog in May 2002, this fictional Sorcerer turned occasional eccentric has dedicated himself to embarking on a continuing Quest to encourage his fellow New Yorkers to, in his own words, "imagine responsibly!" That Quest has its greatest statement in his website, the somewhat spookily named, yet entirely family-friendly Blackwolf the Dragonmaster's Dark Chambers.'

More info @ wikipedia.org