MIKASA:

Yandere or Tsundere?

A yandere type protects who she loves in a psychotic manner, killing anyone who threatens them.

A tsundere is a type who will never admit they love someone to their face, but will attack or harm someone who hurts or insults the one they care for.

Now personally I think she leans more towards border-lining Yandere, but three other people I've spoken to insist she's really a tsundere. I think not!!