Cassidy is one of the missing children in the "Five Nights at Freddy's" game franchise. In the games, they are POSSIBLY the possessor of Golden Freddy, appearing in the FNaF2 and 3 minigames and being named in the Security Logbook. They are commonly speculated, though not confirmed, to be the Vengeful Spirit in "Ultimate Custom Night," due to her parallels with Andrew in the "Fazbear Frights" series. In the novel trilogy, she is the possessor of Bonnie, while Golden Freddy is possessed by Michael Brooks. It is unknown if she is the Golden Freddy child in the 2023 film, who is portrayed as a blonde boy; they are a dark-haired girl in the books, and undescribed in the games.