Vexen, Zexion, Lexeaus. These guys are unappreciated. In KHCoM, Vexen was really nasty and liked to play mind games, like a mental torture. Zexion was also a mind game kind of guy, and Lexeaus was fierce and didn't hold back. The fact that they are the "quieter" members and some of the creepiest, I'd say that they are. I mean, Xemnas, he talked and attacked and did all the things a bad guy should, but Vexen, Zexion, and Lexeaus were very strategic and very powerful. These guys were evil. It's just the fact that they were easily beaten and played a small role in the story that didn't make them as "evil." I say give them some credit.