Nifa

Nifa is a member of the Survey Corps who appears to be of some high rank.

Appearance
Nifa has relatively short hair that is parted in the middle. She is only slightly taller than Levi and is usually seen wearing the standard Survey Corps uniform, but did wear a simple shirt with a vest at one point.

Personality
Nifa appears to be a loyal person as she was allowed to record the details of Erwin Smith's meeting with Dot Pixis, and was then entrusted to tell others about it. She acts serious but is still shocked at how Levi treats Historia. However, she is shown drinking what can assumed to be an alcoholic beverage before giving the report.

Clash of the Titans arc
Nifa is first seen on top of Wall Rose with Ymir after she had revealed that she is a titan shifter and saved Reiner, Bertolt, Mikasa, Historia, and Connie at Castle Utgard. Nifa is ordered by Hange to take Ymir to Trost District so that she can receive medical treatment. After Reiner and Bertolt reveal themselves as the Armored and Colossal Titan, she remains on the wall to face the Colossal Titan.

The Uprising arc
Nifa is not seen again until after Eren has been rescued and Levi's squad are at their new base. She sits silently with Hange Zoë, Keiji, Moblit Berner, and an unnamed Survey Corps member that wears goggles, while they are being told of the plan for Eren to seal Wall Maria by hardening his Titan body like the Female Titan did.

Nifa arrives during the meeting of Pixis and Erwin with a note informing Erwin that the Reiss family are the true rulers, and Historia is part of that bloodline. She then joins the meeting and begins to take notes on what they both say and on Erwin's orders. She leaves the meeting and heads to Levi's location to deliver Erwin's instructions about replacing the king with Historia if Lod Reiss does not have satisfactory answers.