My opinion: Bray Wyatt.
Vince McMahon
The Undertaker
I mean, it depends on what you mean. Like is the gimmick itself purely evil or is the wrestler themselves pure evil?
If we're going by gimmick, then maybe cult leader Bray Wyatt.
If we're going by the wrestler itself, then Grizzly Smith.
The Miz
What do you think?