Nifa was a relatively thin girl with short dark hair that had straight bangs and straight ends. She was only slightly taller than Levi and was usually seen wearing the standard Survey Corps uniform with the usual green hood. Casually however, she was seen to wear a filled, loose fitting, long sleeved dress with dark boots and a front laced corset at one point.
Nifa appeared 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 pass the information to others. She acted serious most of the time but was still shocked at how Levi treated Historia. However, she was shown drinking what it can assumed to be an alcoholic beverage before giving the report.
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, Krista, and Connie at Utgard Castle. 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 Colossus Titans, she remains on the Wall to face the Colossus Titan.
Nifa is not seen again until after Eren is rescued and Levi's squad are at their new base. She sits silently with Hange and other members of her squad, while they are being told of the plan for Eren to seal Wall Maria by hardening his Titan body like Annie Leonhart was able to.
Nifa arrives during the meeting of Dot Pixis and Erwin Smith 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.
While Reeves' corpse is being transported, Nifa briefly converses with Levi about the plan to rescue Eren and Historia and his past with Kenny Ackerman before she is shot in the face and killed by the man himself, who is after Levi.
- Isayama has stated that Nifa and Armin Arlert were likely aware of their resemblance in looks with each other because it was often mentioned by others.
- In a Q&A with FRAU Magazine, Isayama stated that Nifa was the most stylish member of the Survey Corps.