Mikasa is probably my least favorite aot character. I don't mean to dislike her, she's just too protective, and too good at fighting, and has too dark of a back story... basically she has too many perfect protagonist qualities (despite not being the protagonist). Her Dere type, however, is a different story.

I'm not really sure if I think Mikasa is in love with Eren or not. She might just think of him as a brother, but she sometimes acts like she like-likes him. I'm not saying I ship it (Ereri all the way), but it would certainly be cute for her to be part Tsundere. But I think she'd be mainly Kuudere. Like, 70% Kuudere, 25% Tsundere, and 5% Yandere. She carries a fucking sword, and is over-protective... she is at least five percent yandere!

~~~~Example~~~~

Eren: (Is being beat up by Levi)

Levi: (Is beating up Eren)

Mikasa: Heichou! Leave him alone! (Twitches with anger)

Levi: Why should I? He your boyfriend, or something? (Said with evil glare)

Mikasa: (Blushes) N-no...

Levi: Then I'm well within my rights.

Mikasa: (Anger takes over, and she attacks Levi)

(Levi fights back, and Mikasa loses because Levi is better in every way)

~~~~End of Example~~~~