Who's This? One of Batman's doofiest villains ever, and he's on page 16 of Who's Who volume XXIII.
How you could have heard of him: The character is silly enough that he's been used a few times on the Brave and the Bold cartoon, but in comics? Grant Morrison made him a denizen of Limbo back in Animal Man #23, and he had a cameo on Formerly Known as the Justice League #4. More recently, a crazy version of him appeared in Morrison's Batman (#675) which sounds cool except the art is some of the worst I've ever seen. Lately, a cultist-like version of him has been showing up in Batman Eternal.
Example story: Batman #231 (1971) "Blind Rage of the Ten-Eyed Man" by Frank Robbins, Irv Novick and Dick Giordano
Played straight like this, he's an interesting figure, I think. Topical and with a superhuman ability that creates new challenges for the Batman. Might have worked better as a crime boss with a quirky skill, possibly. Once he put on a costume, I think that was the death knell for the character, and Crisis' Marv Wolfman was apparently ringing the bell enthusiastically.
Who else? I skipped over fellow loser the Tattooed Man, but the concept has had several iterations, including one that had its own mini-series. Looking ahead, I might be staying in the Batman Family.