Yes, the OPM manga has come to an end. The creators completed the narrative, providing closure to the fans. Although some might have hoped for more, what was presented was a comprehensive and conclusive tale.
I think 'Overlord' is a great one. The protagonist, Momonga, is an undead overlord in a new world, and his actions and the way he rules his territory can be seen as villainous in the eyes of some. 'Akame ga Kill!' also has some interesting villain - like characters. The organization in the anime, such as Esdeath, has cruel and power - hungry motives. Another good one is 'Kabaneri of the Iron Fortress'. The Kabane are like villains, and the story also shows how some humans can turn into something close to villains in the face of survival.
Definitely! The OPM manga offers a lot of action, humor, and interesting storylines. The art style is also top-notch, which adds to the overall enjoyment. But, of course, it depends on your personal taste in manga genres.