Morally grey?
Nuanced evil?
Lovehead psycho?
I like these suggestions (●'◡'●)ﾉ
The titles I am using tho are from the alignment chart (from Dnd), it's a chart commonly used to locate the characters moral and ethical position:
Lawful good, neutral good, chaotic good, lawful neutral, neutral neutral, chaotic neutral, lawful evil, neutral evil, chaotic evil
Search on Google your favorite anime/Manga/manwha and add "alignment chart" and you will get a better idea of how to use itヾ(❀╹◡╹)ﾉ~
For example: Naruto alignment chart
Is woyoung chaotic neutral?
Or lawful evil? I don't think he is "evil" per se...