Kamen Rider (TV series, the titular character)
to wear a mask; to hide one's true intentions
couple who only go through the motions of being husband and wife
Confessions of a Mask (1949 novel by Yukio Mishima)
Moonlight Mask (fictional superhero)
Glass Mask (manga series and media franchise)
student who is trying to get into their preferred college while already enrolled at another college
smile mask syndrome; state of constantly smiling and suppressing one's emotions