You could call yourself the Brain Teaser.I'd like to either be a less-angsty female version of the Riddler or a female Scarecrow with a decent costume. (I don't mean Scarecrow's costume is bad, I mean the "Mistress of Fear" costume is bad..."you couldn't pay me to wear that" kind of bad; I'd rather walk round naked...which might...yeah. ._.)
Reality is, I'd probably be a sucky super villain, so...eh. -shrugs-
Failing my original plan, I would be the Pun-isher and would go around making terrible puns. I'd p*ss off so many people.