"unknown" is not in the list (Male, Female, Unknown, None) of allowed values for the "Gender" property.unknown
Kisaragi, Aoi
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Aoi Kisaragi is the name of a KaibaCorp worker who was one of Trueman's victims.
Their named appeared on a list of names of people at KaibaCorp. Each name disappeared after Trueman sent them to the world of Darkness. Aoi was the second last to disappear from the list, leaving only Kazuhiko Mashirito and Seto Kaiba.