When a character feels they are not human, due to a certain situation that occurred, they may ask What Have I Become? and declare themselves as a monster or a freak. When the character is either not human or is a Half-Human Hybrid, they may feel like a monster if others are scared of them or call them a freak.
This trope can also apply to non human characters, as long as something about them [...] [tvtropes.org]