Editing Subject X

'''Subject X''' is a mysterious girl mentioned in ''[[Kingdom Hearts III]]''. While her true identity is not specified, she is a character who has previously appeared in the series,<ref>[http://dengekionline.com/elem/000/001/886/1886230/ ''Kingdom Hearts III'' Interview with Tetsuya Nomura (Dengeki PS)]; '''Interviewer''': "Many people who have finished KH3 are interested in the "girl" that Lea and Isa were looking for, and the existence of the "NAMELESS STAR" in the Final World. Can you give us any kind of hint about the truth behind these girls? Are they characters who have already appeared in the series?" / '''Tetsuya Nomura''': "I think this is also possible to figure out for yourself if you look at all the secret reports, but yes, they are characters who have already appeared in the series. You will find out who "NAMELESS STAR" if there is a next time." [https://www.khinsider.com/news/Dengeki-Playstation-interviews-Nomura-on-Kingdom-Hearts-3-14711 Translation via Goldpanner].</ref> and is implied to be a time traveler from the age of fairytales.<ref>'''[[Secret Report 3]], Terra-Xehanort:''' "What fragments can be gleaned evoke a bygone world, like one out of fairy tales. As improbable as it seems, the question may not be where she has come from, but when."</ref>

Sometime during [[Terra-Xehanort]]'s time as a researcher working under [[Ansem the Wise]], Subject X appears in [[Radiant Garden]],{{storylink|Secret Report 3}} unconscious, and is placed in a cell in the castle's laboratory. A week later she is able to speak, but she is only able to recall having four friends and a key, and the phrase "May your [[heart]] be your guiding key", despite the prodding of the researchers.{{storylink|Secret Report 1}} Xehanort plans to probe her heart in hopes of restoring her memory, as he believes she may have traveled through time.{{storylink|Secret Report 3}}