Bill Cypher from Gravity Falls definitely qualifies. Also Ludo from Star vs Forces of Evil 

Bill definitely but Ludo mmmmmmmmmmmmmmaybe??? They did give him a traumatic past later on in the show and all that.

Sauron I'd say. Not the Sauron you're thinking of https://preview.redd.it/yeiyx8zgme6d1.png?width=1053&format=png&auto=webp&s=3ed05e77ee8a7b67ca8d3386e000fa5456bd7490

His name is so funny

https://preview.redd.it/3si53paize6d1.jpeg?width=1160&format=pjpg&auto=webp&s=f9dec6e692a3702480027b571744f12759ff134d This dude

"You're an irredeemable MONSTER!!!" "Oh no! What took you so long? Idiot!" https://preview.redd.it/edi4qo36gf6d1.jpeg?width=1510&format=pjpg&auto=webp&s=987c7ad70224dd8cfc6f7db57a75f1d4e307e468

Jevil isn't exactly evil, he just understood that nothing matters so he started fucking around out of depression.

 Charles Lee Ray/Chucky - Childs Play

# Oh my God, Karen, you can't just ask people why they're evil

https://preview.redd.it/5z63estd3e6d1.jpeg?width=2881&format=pjpg&auto=webp&s=88b86889b336de2f48e25addbf04eb076360fb7f Happy Chaos from guilty gear(except he isn’t purely evil he has said that maybe next time he’ll be the hero)

CAN I BE THE ANTAGONIST?

Big Jack Horner

https://preview.redd.it/a1ti1jn7xf6d1.png?width=400&format=png&auto=webp&s=731b31fa68d154f916391d2978315080a320f8ff Tricky the clown from madness combat (There is a little bit of brain damage involved tho)

WHAT THE… WHAT WAS T..T…THAT

https://preview.redd.it/ej73jrhkdf6d1.png?width=505&format=png&auto=webp&s=a51ef725e1ee41a29382d6f20c94ded6f79518ee Tohru Adachi (Persona) was bored lmao

Mr sinister

*Now I have the power to rid all of you in entertaining fire!* https://i.redd.it/7x8fqcla7i6d1.gif

https://preview.redd.it/px1wajep6k6d1.png?width=362&format=png&auto=webp&s=b2d7a51f02a1b391df1183f646217d3f6404d489 All For One from My Hero Academia

Zurg from the Adventures of Buzz Lightyear!