HerStand, Face/Off, could switch the faces and fingerprints of any two people, so Kira grabbed a random passerby with a similar build, and had her switch their appearances.
Face/Off (フェイス/オフ Feisu/ofu) is the Stand of Aya Tsuji from the 37th universe, featured in the light novel JORGE JOESTAR. It is only mentioned in the 6th chapter when Koji informs Joji on how Yoshikage Kira used her Stand to change his identity, later on murdering her.[1]
Face/Off appears similarly to Aya's original counterpart's Stand, Cinderella, but with some differences. Hence its name, it doesn't have a face or legs. It's head resembles a lamp, and a chest which appears to have a bra. It has mechanical-like arms and has a lower body in a ball-like shape.
Abilities
Like its original counterpart, Face/Off is able to change the appearances of any person. Giving Kira a chance to escape and change his identity. In the novel, it is only said that it can change the faces and fingerprints of any two people.[2]