Mutant Power: Ability to control other people's minds (presumably no more than four at once, though)
Voice Actor: Ron Halder
First Appearance: "Mindbender"
Back Story: Little is known about Mesmero's past. Apparently, Mesmero was somehow psychically "recruited" by Apocalypse sometime in the past, and has been sent to retrieve the three keys needed to release Apocalypse from his prison. (He could also have been "chosen" by some ancient prophecy form birth and thus had the weird glyphs tattooed on his head.) After he released Apocalypse, though, Poccy essentially abandoned him. Although Mesmero is still somewhat loyal to Apocalypse, he was a bit disheartened after Apocalypse moved on to other things.
Personality: Mesmero hasn't had many lines, so it's difficult to pinpoint his personality. He likes to laugh darkly when he gets his way, though, and he has a Transylvanian accent. He's also quite intelligent, as he's managed to throw together plans that have outwitted both Xavier AND Magneto. (Admittedly, though, this might have been with the mental help of Apocalypse.)
Final Reflection: Evo certainly improved upon Mesmero's character, as he was no longer a weird little goblin-man, but a formidable, intelligent, mystical tattooed man. Me, I'd like to see what his mindset was after he had learned that Apocalpyse failed on his mission, though...