Bl :
https://www.mangago.me/read-manga/after_killing_you/
https://www.mangago.me/read-manga/psycho_young_dream/
https://www.mangago.me/read-manga/moritat/
https://www.mangago.me/read-manga/stalker_s_game/
https://www.mangago.me/read-manga/kansai_jin_to_hukuman_satsujinki/
Gl :
https://www.mangago.me/read-manga/saji_chan_no_yami_nikki/ (fucked up max)
https://www.mangago.me/read-manga/your_fetters/ (toxic asf)
https://www.mangago.me/read-manga/the_barefoot_nina/ ( very toxic)
https://www.mangago.me/read-manga/kitanai_kimi_ga_ichiban_kawaii/ (fucked up)
https://www.mangago.me/read-manga/i_m_more_dangerous_than_you/
https://www.mangago.me/read-manga/manipulate_my_heart/
https://www.mangago.me/read-manga/tatoe_sekai_ga_owattemo_watashi_wa_kanojo_wo_erabanai/
https://www.mangago.me/read-manga/plaything/
https://www.mangago.me/read-manga/obscene_lnvasion/ (anthology so just gotta read them and see what ya like)
https://www.mangago.me/read-manga/secretary_jin_s_confinement_journal/
https://www.mangago.me/read-manga/it_starts_with_isaac/ (Top is a dark guy for sure lol, you either love it or ya dont. I still cant decide which one I am. Just felt bad for the bottom the whole time but I liked a crazy top with separation anxiety lol)
https://www.mangago.me/read-manga/love_jinx/
https://www.mangago.me/read-manga/gwanggong_industrial_complex_please_candy/
https://www.mangago.me/read-manga/sura_s_lover/ )I think this one gets the most dark out of all of them so keep that in mind. also the most insane for love lmao)
https://www.mangago.me/read-manga/a_physical_education/ (I mainly kept reading this for a dominant bottom, the art style was iffy at some points lol)
https://www.mangago.me/read-manga/cozy_obsession/ (I really liked the concept of the story for this)
https://www.mangago.me/read-manga/dead_man_switch/ (zombiessss)
https://www.mangago.me/read-manga/red_mansion/ (Both crazy in different ways)
https://www.mangago.me/read-manga/the_hounds_of_sisyphus/

Romance with a dark, bad guy/ insane for love?
Thank you in advance <3