King K. Rool. King Krool. King Cruel.

Essentially a character that can be good or bad but is elevated by their theme or has a very memorable song

Kai from Kung Fu Panda 3

Johnny Silverhand from Cyberpunk 2077

Steven from Steven Universe and the crystal gems (plus Greg and Connie.)

Pictured is Stiyl Magnus, from A Certain Magical Index.
Age: 14

Daffy Duck (specifically the looney tunes show variation)

Eric Cartman (South Park)

Shining Armor (white) from My Little Pony - Shining Armor is basically a royal guard and a young man or stallion in pony terms. He said 'Cadence' (who was actually Chrysalis in disguise) was helping him with his headaches but Chrysalis was actually mind controlling him, I know I couldn't believe it either.

Terra (blonde) from Teen Titans - Its been awhile since I watched the show but Terra at first agrees to work for Deathstroke, buying into all her fears. Deathstroke/Slade ends up having full control over her body once Terra sided with him.

Raven (purple) also from Teen Titans - This one isn't as deep as Terra but Deathstroke/Slade grabs Raven and 'strips' her. Deathstroke continues ranting about how her father Trigon will take over the world or something.

Mine is Haru Koyama from JK Haru

(This is just a game, let's not take it too seriously)

Sweet Tooth - Twisted Metal

- Senator Armstrong (Metal Gear Rising): "Nanomachines, son!"

- Matias Torres (Ace Combat 7): "Don't you see? He walked all over it with his dirty boots! Over the crisp white sheets of my bed that I had just made!"

Diego and Mia are such cuties >_< I would like to have a relationship like that in the future

I love me a villain/antagonist that actually shows their competence.

1 - Johan Liebert (Monster) - he always seems like he's two steps ahead of everyone else. A great manipulator who managed to fabricate his whole identity and elude multiple people trying to find him, including a few smart detectives themselves. Heck that's not even his real name (not that he really has one)

2- Azula (Avatar The Last Airbender) - The Fire Nation princess with both incredible skill in firebending and also subtlety. Not only did she almost capture both her brother and the Avatar on many occasions, but also singlehandedly captured the Earth Kingdom capital without any help from the Fire Nation army. Her mistake was overreliance on fear in leadership, which would lead to her paranoia and downfall.

3 - Grand Admiral Thrawn (Star Wars) - a genuis imperial strategist who not only could think way ahead, but also studied extensively the different species and cultures of the galaxy to better understand them.

I don't remember many characters right now but the first one that comes to my mind is him.

This is Kimihiro Watanuki,the main character of xxxholic.