Kariko Tokoyama was a famous hair dresser who appeared in episode 036. According to an article in a magazine that Usagi has, Kariko won the world hair design contest the previous month. In episode 036, she opened a salon in the Juuban Shopping District and, in celebration of opening, decided to cut hair for free for a while. Minako took Usagi to the salon to cheer her up by changing her hairstyle. When they arrived, they found that Kariko had actually been brainwashed by the Dark Kingdom, and was part of a plot by Kunzite to find Sailor Moon. In a previous battle, Kunzite had managed to take a hair from Sailor Moon. He used hair steamers in Kariko's salon too analyze the DNA of all the women who sat under them, searching for a match to Sailor Moon's hair in order to find her true identity.

When Minako Aino sat under one of the hair steamers, it identified her as Sailor Moon. Unbeknownst to her, one of Usagi's hairs had gotten mixed in with her own while she was brushing Usagi's hair. Kariko thought that she was Sailor Moon, and rushed over to confront her, demanding that she hand over the Ginzuishou. She then stepped back, and several salon attendants surrounded her. She and the attendants came together to form the youma Mitsuami. Meanwhile, Usagi managed to crawl to safety and transform into Sailor Moon. When the real Sailor Moon showed up, Mitsuami left Minako alone long enough for her to transform into Sailor Venus and contact the other Senshi. After a brief battle, Sailor Moon used Moon Healing Escalation to heal Mitsuami, causing her to transform back into Kariko and the salon attendants. Later, Kariko returned to her ordinary life.

(Source: The Oracle :: BSSM Encyclopaedia)