Cheating with partners family member (not main love interest)

Mentions of past trauma as a child

Physical confinement

Severe psychological manipulation

Lack of autonomy

Social Isolation 

Feral Child Syndrome 

Social withdrawal in childhood

Child Abuse 

Child Neglect 

Child abandonment 

Deprivation of rights and freedom of an individual and/or child 

Captive child syndrome

Sexually Explicit Scenes 

Bullying (not between main characters)

Death

Murder

Use of multiple weapons

Some torture

Carving skin 

Death of parental figure