I'm looking for manga like HEAT only shounen, with an actually evil main character doing bad things.

So like, if in Hajimete no Aku the main characters were actually evil instead of whatever it is they are, that would fit...

I don't mean things like kyou kara ore wa since he has a pretty nice side to him, I mean more like Anne Freaks since they're pretty evil.

Edit: Ugh, I just noticed I say "like" too much.

....
Maybe Togari... unfortunately, I am not sure if he can still be considered still doing "bad" thinks... as it was one of the first series I read (can't remember the details).

You'd like Kami no Kodomo if it wasn't josei.

[color=green]"Officially, this machine doesn't exist, you didn't get it from me,
and I don't know you. Make sure it doesn't leave the building."[/color]