Maybe Cautious Hero: The Hero Is Overpowered but Overly Cautious? I haven’t watch it, but from the clips I seen is funny, and kind of suit what you are looking for.
Code geass
magic emperor
Manga with emotionless/apathetic MC’s:
http://www.mangago.zone/home/mangalist/1057049/
Weak hero
Legend of the Northern Blade
Berserk
Does anyone know any good manga/anime with a heartless, smart
and badass male main character with no love interest?