What a looking for is stories where the main plot revolves around a character crushing a large number of people. Basically the MC for one reason or another end up against big organization like police,military or some superhumans fanfics/manga/light novels all are fine an example of what I liked : - Rooftop Swordmaster - Buu incident (DBZ X BNHA) - Here Be Dragons (Worm fanfic)
Nine Star Hegemon Body Art - unbeknownst to the MC, he's an irregular that doesn't fit with the Heavens, so he's unnaturally picked upon by almost everyone. In the beginning, he's on the run a lot, yet he doesn't fear going up against higher realm opponents. After he gets some power up, he's taking on multiple sects and factions simultaneously. He doesn't want to be a murder hobo, but if they come for him, he'll respond accordingly. Main Character Hides His Strength - he's literally "the enemy of the world" (otherworld, that is), every faction is out to kill him. Emperor of Solo Play - with his second chance, the MC is out to show up all of the Guilds by surpassing them on his own.
Maybe these will fit you. Edge of the Apocalypse Sage Monarch Dragon-Marked War God Dungeon Defense Great Demon King
Thanks for the recs but what am looking for is an OP mc who for some reason end up fighting a large group of people, that must be the main plot not simply an arc
What about Summoned Slaughterer? It's a JP novel where MC is a martial artist and gets isekai'd but when he gets there, he kills a lot of people.