Oops, i forgot to add ''favourite'' on the title!

@Shredder 18 It's ok, I know you mean that.

Not just the Lich but also Dick Hardly from The Powerpuff Girls as well (1998 version not the 2016 version [tho he wasn't debutable in the 2016 version because he's deceased])

The lich always terrifies me, every time he shows up, you know things are getting serious.

@Enragedshadow It's a cartoon with questionable continuity. It's very rare that characters -- including villains -- actually stay dead. I'll bet you 5 dollars he'll be back somehow in some extended media.

Besides, we never get to see his dead corpse, he's probably just hiding.

@SpaceProtagonist yeah my mistake. thats my bad

Slade. Easily. Ron Perlman was the best choice for this character.

What does PE mean?

It means Pure Evil: Being the darkest, or ONE of the darkest characters in the whole franchise, and not having any redeeming qualities whatsoever.

• They're stand out in terms of heinousness in the show and are never portrayed in a positive manner (unless it's a ploy to bring their foes into a false since of trust, only to betray them, or subvert their positive traits)

• They're always taken seriously, especially in-universe providing fear, revulsion and hatred from the other characters in the story -- and sometimes even other villains. (So comedy villains can't be PE, unless they bring a sense of darkness the other villains lack.)

• They are completely devoid of altruistic qualities. They don't show any remorse for their crimes and they absolutely can't redeem themselves.

And that's just the basics. I can explain more if you want.