Janet

Janet ( ジャネット) was an assistant of Nakanishi Kouta's after the latter fired Ike-san. Throughout the performance, she kept screwing up on purpose. It was later revealed that she was actually a spy working for another magician. As she tried to screw up Kouta's last act, Saiki Kusuo intervenes. Due to that, the act was a success in the end.

Trivia

 * Although Janet does not appear in any episodes of the anime, she does have a brief cameo in the first ending, Psi desu I LIKE YOU.