Well, one of the classic "Evil, because I am Evil" characters would be Dick Dastardly perhaps most well known from the wacky races series of cartoons.
Perhaps in a less farcical sense is the Mum-ra character from the Thundercats cartoon, who regularly invokes "The Ancient Spirits of Evil" which grant him a great boon of power and strength.
As I think about it, you must also mention the "bad guys" of the Rocky and Bullwinkle cartoons; Boris Badenov and Natasha Fatale.
Additionally; a spin-off, The Adventures of Dudley Do-Right, had a similar villian who was evil for the sake of gloious evil, Snidely Whiplash.
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Perhaps in a less farcical sense is the Mum-ra character from the Thundercats cartoon, who regularly invokes "The Ancient Spirits of Evil" which grant him a great boon of power and strength.
As I think about it, you must also mention the "bad guys" of the Rocky and Bullwinkle cartoons; Boris Badenov and Natasha Fatale.
Additionally; a spin-off, The Adventures of Dudley Do-Right, had a similar villian who was evil for the sake of gloious evil, Snidely Whiplash.
I'm sure there are more.. gotta ponder a bit.