FL: self-sacrificing for the ML's sake, headstrong yet also timid
ML: Violent, Possessive, swayed by the FL's affection (tragic villain)
FL's Family: Doting and supportive
2nd couple: supporting characters highly linked to the novel world
Antagonist: Vile, Mysterious, dangerous being
Atmosphere: Traumatic (esp the ML's life) and Dark Romance
Special Tag (Time&Dimension): HUGE SPOILER, but it's a key concept to how deep the MCs relationship go
The Villain's Savior