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Kingdom Heartsis known for its compelling, yet extremely convoluted plot. On the surface, it’s a classic story of good versus evil and a young boy’s dreams of visiting new worlds. But underneath it all, there’s a sprawling tale that’s full of unique characters, some of who have yet to be properly introduced.
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One of the most mysterious characters in the series is Subject X. This mostly unknown character is neither a major nor supporting one, but they might appear in the limelight soon enough. We take a look at the minimal information we know surrounding Subject X and analyze a possible theory as to who they might be.
What Do The Secret Reports Tell Us?
The entirety of what we know about Subject X is found in theSecret Reports found inKingdom Hearts 3. There are 13 total Secret Reports to unlock in the game, all through completingBattlegates.
Battlegates are a collection of 15 challenges in which you’ll battle waves of enemies, and which become available in various worlds near the end of the game.
Among the 13 Secret Reports, onlyfive of them directly relate to Subject X.
Secret Report 1
This document is fromSubject X’s perspective, and details how she woke up in a cell with no recollection of anything, other than havingfour friends and a key. She writes how researchers would come to her room andperform experiments on her.
While in captivity, she befriended two boys,Lea and Isa, but one day she was taken away by a man wearing an eyepatch (Braig). The report wraps up with Subject X stating theystill aren’t any closerto understanding who they are.
Secret Report 3
Xehanort details when Subject X was discovered inRadiant Garden. The young girl was found shortly after dawn and appeared to be15 years old. After seven days, she finally spoke words but had no idea who she was.
Xehanort explains how Ansem the Wise hasceased the experiments in his heartand wants to continue them on Subject X.
Secret Report 4
Xehanort continues with his experiment notes and believes she might have come from adifferent time period. He isn’t able to extract much from Subject X, but he states the fragments of information from her describe a"bygone world, like one out of fairy tales."
This could mean that wherever Subject X came from no longer exists. However, Ansem the Wise found out about his experiments andimmediately terminated them. He also ordered the release of the test subjects, including Subject X. Xehanort lost Subject X and never found her again.
Secret Report 5
This report is from Saix, the Nobody of Isa. It waswritten as amemoirand reflected on his childhood with Lea. The pair would scout the castle at Radiant Garden andplanned tosneak inside. When they finally managed to break in, they immediately regretted it and tried to find a way out. Instead, theyfound Subject X.
Secret Report 6
Saix’s memories continued as he described the two getting to know Subject X. She didn’t have any memories butthey wanted to help her escape. They promised that they would return for her but when they returned,she had vanished.
They searched for her constantly but to no avail. Lea and Isa decided to becomeapprentices to Ansem the Wiseto continue searching for Subject X.
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Subject X Theories
Theorizing the future of Kingdom Hearts is commonplace among fans, and figuring out Subject X’s identity is no different. Initially, some speculated thatSubject X wasAva, one of the Foretellers but director Tetsuya Nomura confirmed that Subject Xwas not AvainKingdom Hearts 3 Ultimania.
Another running theory is thatSubject X is someone fromKingdom Hearts Xand because Nomura confirmed it wasn’t Ava, the other two candidates are Strelitzia and Skuld. However, Strelitzia waskilled by Darkness in Kingdom Hearts X, so that leaves Skuld as the most likely person.
But how could Skuld connect with the current characters? Similar to how Roxas is Sora’s Nobody with the appearance of Ventus, the theory explains thatXionwould be retconnedto have more of a connection with Skuld and their heart might bedeep inside Xion. This would explain why Axel, Lea’s Nobody, viewed Xion differently compared to the other members of Organization 13.
There’s also a scene with Axel and Saix in Kingdom Hearts 3, where the two are talking about trying tofind a missing girl. We can speculate that the missing girl is Subject X.
It was also revealed in theKingdom Hearts Character Files bookthat Subject X hasblack hair, which would also point toward Skuld. Ultimately, we can hope that Subject X’s identity will be revealed in Kingdom Hearts 4.
