YES! Elfen Lied, that Mephisto quote is my absolute favourite. I used to listen to that so much. (and yes, I mean listen). Have you heard the extended version of it? Its on the diablo wiki front page. Except the voice isn't evil, but what he says is cool.
What are your favourite quotes from either the game or the books?
(is this in the right place?)
Mine is when Uldyssian is a captive of Lucion:
"Damn you!"
"Thank you, I already am. Shall we go?"
Lol, I love Lucion's reply. I imagine him saying it quickly and high pitched.
Its a bit of a cliche line, but still, its funny.
There's likely more, its just that I happen to have just come across this one just now and it really made me laugh.