completed ones and not weird please
There's no cucking in the story. There's just an annoying arc where the FL ex suddenly appeared. He used to date the FL only for a few days, and he's a literal piece of shit, which something the FL will find out. Later he will got shit on by her brother and never appear in the story again, it was satisfying. The FL was also being very annoying on this arc, but it will get better
Blame! (EVERYONE SHOULD READ THIS ONG)
Grand Blue (it's not completed but chapters are releasing around once a month or two, so no point waiting until it's finished. funnies manga i have ever read)
20th century boys (probably naoki urasawa's best work)
Vagabond
Leviathan
Claymore
Holyland
Tomodachi Game