MikaYuu (main Characters)
Vampire, Demon, Monster hunter.
Childhood friends, friends to enemies to friends to lovers
Fanservice included, physical innuendo.
kuro & Mahiru, misono & snow lily, jeje & mikuni, Hyde & licht, etc.
Master X servant, vampires, capital sins
Fanservice included
Tang Hui & Xiao Rong
One-shot
Non-human turns human, roommates
Worrying for someone's life.
No fanservice, only bromance.
Yoseob X Jaeha
Psychological, violence, school life.
Raised as siblings, one of them has an unhealthy obsessive affection for the other, who is partially oblivious and partially accepting of it.
Bromance and Fanservice.
Hyeongoh X Namsoo
Psychological. Violence. School life. Tw: tripophobia, blood, bullying.
No spoilers. Strong bromance. Fanservice present.
Hinata x Ayato
School life, slice of life, family, cute
It's adorable and a confession or kiss away from shounen-ai
Bromance and Fanservice presents, too shippable.
Ameri X Nishino
Violence, bullying, revenge,
Very graphic. Contains torture, rape, kidnapping and murder, gaslighting and manipulation, you know the drill.
Ameri is obsessed with nishino (and I'm obsessed with ameri), and Nishino is too innocent for his own good.
Fanservice included, strong BL subtext and other characters constantly confusing their relationship as romantic.
Edit: checked the raws. Aren't they basically dating at that point
Deok-hee (idol) X Yool (manager)
Manager slowly becoming obsessed with the idol, jealous of the people in his life even.
Contains death/suicide/murder and constant appearance of corpses. Stalker/sasaeng behavior is the main theme.
Twisted bromance, again more like obsession, and light Fanservice
Shishigami (main antagonist, high schooler, treated as a second main character) X Andou (best friend)
Andou is the only person Shishigami seems to care about (1st appears in ch. 8)
Both strong bromance and light Fanservice happens
Owari no Seraph