Karl Custer is a fandom oriented stand-up and improv comedian, more commonly known by his stage name, Uncle Yo. He's been performing at various geek community events—primarily anime conventions, but also gaming conventions and science fiction conventions - since 2007, beginning with DexCon and Zenkaikon. He has performed at over forty anime conventions as of April 2011. He has acted as a Master of Ceremonies (usually at cosplay masquerades), discussion panel leader or presenter (with typical panels named "Anime Match Game" or "Cosplay Burlesque") and game show host. His themes revolve around Otaku and Japanese culture, anime and manga, comic books, popular science fiction and fantasy franchises such as Star Wars and Star Trek, as well as video gaming, tabletop gaming, role-playing gaming, and LARPs.He has been described as "Renaissance Nerd", "an emerging act in the world of conventions" (in 2009) and a "geek-specific Otaku Renaissance man comedian" who "has taken the convention circuit by storm." His work has been described as touching on "several time periods and genres of animation and general geekery" with "rich knowledge of fandom". He's also appeared on That Guy with the Glasses, specifically The Nostalgia Critic, Demo Reel, and Dragonbored.
Tropes associated with Uncle Yo: