how overpowered? no struggle type like solo leveling and mob?
what type/genre/demographic?
I'd say Beelzebub's MC is overpowered if you're looking for comedy shounen
Negima is an overpowered MC if you're looking for ecchi shounen
weird as it was, Meliodas is overpowered
Nidome no Jinsei wo Isekai and
Sekai de Tada Hitori no Mamonotsukai had a bit underwhelming ending
edit:
if you're fine with old school, then go for Hokuto no Ken and Samurai Deeper Kyo
if you're fine with trash, maybe Magician of the Inferior Eyes