could be anything from multiple personalities to ptsd to autism to repressed memories

Main character is/was either orphaned or abandoned; that fact may either be a major or minor theme in the drama.

leads seeking revenge across the genre spectrum

anything from deafness to blindness to a limp to etc.

Dramas about bodyguards or where one of the main lead characters are one.

drama with a lead who is immortal, but not defined as a specific supernatural being

dramas that feature a significant plotline around amnesia

dramas that have characters that had organ transplant

dramas that feature a character that can see into the future