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The name used is an alias, nickname or surname found in an official source, but the actual in-universe name of this person is unknown in this continuity.
The Mirror Man (鏡男 Kagami Otoko?) is a hypnotist of Shiganshina District who appears in Mikasa Ackerman's experience in another life. He is a minor character in the story "Lost in the Cruel World" of the Attack on Titan: Lost Girls novel and the manga of the same name.
The Mirror Man is dressed in an extravagant suit and cape with a reflective, mirror-like mask covering his entire face.
As a hypnotist, the man prides himself on his ways of controlling others as a part of his hypnosis performances during festivals.
The Mirror Man is present during a festival in Shiganshina District. He sees a little girl on the ground and he grabs her arm then pulls her up, urging the crowd to look at him as he attempts to turn her into a murderer; but everyone is busy watching a fight. He tries once again to attract the attention of the crowd and introduces himself as the Mirror Man. The girl begs him to let her go so that she can see her friend, but the masked man refuses, explaining to her that he needs to hypnotize her into becoming a murderer. The man hands her a knife and proposes a deal to her; if she murders him right then he will let her go.
The man starts talking about how the world is an unfair place by giving the example of humans eaten by Titans. He explains to her that he is tired of going around from festival to festival, performing over and over again. By hypnotizing her into killing him, it would be his greatest and final act, serving as his revenge on the world. The girl stays silent, causing him to grow impatient and tell her that if she does not act soon, she will never see Eren again. The girl is shocked to learn that the man knows her friend's name, and starts to question him about who he is. He tells her that he is no one, but could be anyone at the same time. He says that he knows that she is lost, and advises her to go back to where she came from before it is too late.
Struggling to decide if she wants to stay in this world or kill the man to see Eren again, the girl decides to stab him after some hesitation, but is interrupted by a loud booming sound. As the festival-goers try to locate the source of the sound, a lady starts screaming. They look over to see what the commotion is about and are shocked to find the man knelt lifeless on the ground with a knife in his chest, and blood all over the girl. All of a sudden, the man starts laughing and reveals that he is actually unharmed, showing the knife to be retractable, and the blood to be that of a chicken, then rejoices on how he succeeded in turning the girl into a killer, as the crowd starts applauding.