Who's one of the most demented characters in the VG world? Yamazaki from Fatal Fury/King of Fighters comes to my mind when I think of lunatics. This guy's just off the wall in his craziness. Ninja from Metal Gear Solid is also a good candidate, even if he's not all that evil deep down. Oh, and I'm not counting out Sephiroth either. He keeps it cool on the outside, but the reason why he wants to bring destruction is one very crazy and fecked-up reason indeed, and to explain it would not only be a flipping huge spoiler for those who have not beaten FFVII, but it's too much to type, and I'm going to bed soon. :P

Loonies in video games: who are they?