That we are superior to men is an established fact.
~ The Thalmor

Elves in folklore were often quite vicious (much like fairies), but in modern fantasy, they have become a more human-like race that (while quite cunning and arrogant) tend to be peaceful and quiet, yet there are Elves which stray from this noble path and become extremely villainous and manipulative.

Often refereed to as "Dark Elves" or similar, these beings go back to the more vicious and/or petty nature of their folkloric counterparts. This page also includes villains with elf physiology (not necessary true elves, but at least possess some traits from true elves).