Devil son in law (he's not super manipulative, but is a proper villain)
Idk if you've read these already but
https://www.mangago.zone/read-manga/concentration_of_malice_r19_version/ (as the link suggests it has smut so if ur not comfy w that.. anyway I rlly like the mc and it's a rare fmc who's actually villainous/manipulative)
https://www.mangago.zone/read-manga/master_of_gu/ (manhua is discontinued but there's also a novel)
https://www.mangago.zone/read-manga/i_want_to_be_you_just_for_a_day/
https://www.mangago.zone/read-manga/doku_wo_kurawaba_sara_made/ (this one's a bl)
https://www.mangago.zone/read-manga/tomodachi_game/ (the fanservice is kinda extreme but the manga is pretty good if u can get past it)
https://www.mangago.zone/read-manga/regressor_instructional_manual/
https://www.mangago.zone/read-manga/how_to_live_as_a_villain/
Please recommend me some manipulative or villain mc!!