http://www.mangago.zone/read-manga/survive_as_the_hero_s_wife/
http://www.mangago.zone/read-manga/the_justice_of_villainous_woman/
http://www.mangago.zone/read-manga/charlotte_has_five_disciples/?1bEl
http://www.mangago.zone/read-manga/la_dolce_vita_di_adelaide/?wVN6
http://www.mangago.zone/read-manga/they_say_i_was_born_a_king_s_daughter/?wp38
http://www.mangago.zone/read-manga/reminiscence_adonis/
http://www.mangago.zone/read-manga/otome_game_no_hametsu_flag_shika_nai_akuyaku_reijou_ni_tensei_shite_shimatta/
http://www.mangago.zone/read-manga/i_was_born_as_the_demon_lord_s_daughter/
http://www.mangago.zone/read-manga/death_is_the_only_ending_for_the_villainess/
other commenter already reccommended isekai's so i will avoid that.
~ potentially "evil"/messed up morals main characters ~
http://www.mangago.zone/read-manga/villain_initialization/
http://www.mangago.zone/read-manga/brutal_satsujin_kansatsukan_no_kokuhaku/
http://www.mangago.zone/read-manga/funouhan/
http://www.mangago.zone/read-manga/ouroboros/
http://www.mangago.zone/read-manga/dear_boy/
http://www.mangago.zone/read-manga/save_me/
http://www.mangago.zone/read-manga/an_uncomfortable_truth/
http://www.mangago.zone/read-manga/bastard_hwang_youngchan/?8n4c
http://www.mangago.zone/read-manga/cheese_in_the_trap/
http://www.mangago.zone/read-manga/unordinary/
Escape Room (available on webtoons)
http://www.mangago.zone/read-manga/i_m_a_middle_schooler_becoming_the_demon_lord/
http://www.mangago.zone/read-manga/brutal_satsujin_kansatsukan_no_kokuhaku/ he's fucked in the head but you still root for him ヾ(☆▽☆) http://www.mangago.zone/read-manga/the_hero_who_seeks_revenge_shall_exterminate_with_darkness/
Any recommendations in which the main character could be considered a "villain", someone who tends towards being "evil" in nature?
Thanks