I'm not looking for any antihero that doesn't know what he's doing, I want the protagonist to be truly evil, enjoy doing evil things(beating, killing, torturing etc.). He can be the leader of some group or just a lone wolf.
It's really hard to explain what i want.....think of Yagami Light, in his mind everything he does is justified to create a new world order. That's the kind of psycho I'm looking for. A manipulative, self deluded crazy bastard that thinks he's allowed to do everything and thinks other people are just there to do his biding or to be beat up.
Thanks. I'll take all the help I can get...I've never been able to find something like this that I can enjoy. for me this concept is amazing but all the ones I've found are far below my expectations.

"Akumetsu" maybe?

More on the comedic side but otherwise Ni Xi Ba Mo Wang! sounds like it might be what you're looking for...

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~4400 manga completed
~1700 ongoing...

superior the main character is a villain at the beginning but throughout the story reforms so it's probably not exactly what you're looking for but it's still worth a read.

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"You cannot understand that which you do not know and that misunderstanding breeds hatred."
-a night of a thousand dreams

Re:Monster - a human is reborn as a goblin. The ruthless, calculating mind of a human, with a goblin's strength. He's doesn't mind doing whatever it takes to gain power.

Ajin, maybe. Though Kei is more apathetic antihero than true villain.

ib - instant bullet, kind of. More at the end than the beginning.

Kami no Kodomo's protagonist has the dubious honor of being the most abhorrent I've ever read.

Wolfsmund, at least for the first few volumes.

Zerozaki Soushiki no Ningen Shiken, kind of.

There's also series like Murciélago and trash. where the protagonists don't hesitate to maim/murder opponents, though they're not exactly villains since they're still technically working for the "good guys."