serious business, revenge edgy type of op mc
http://www.mangago.zone/read-manga/ranker_who_lives_a_second_time/
emotional/tear-jerker, crusader type of op mc
http://www.mangago.zone/read-manga/saihate_no_paladin/
lgiht-hearted, mc has op online shopping site + 2 OP beasts that follow him around
http://www.mangago.zone/read-manga/tondemo_skill_de_isekai_hourou_meshi/
solo type adventure, girl turned into a spider with an RPG power, op after leveling up
http://www.mangago.zone/read-manga/kumo_desu_ga_nani_ka/
They were OP and then went back to their youth. Now they slowly regain their strength but they are considered geniouses because of their knowledge and experience. They are not ecchi but the latter can be considered harem even though the MC already has eyes only for one.
Master of gu, Tales of demons and gods
I Am The Sorcerer King Webtoon
CAN SOMEONE PLEASE RECOMMEND MANGAS LIKE SOLO LEVELING??? A OP MC? NO HAREM OR ECCHI THOUGH.... ISEKAI IF POSSIBLE