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Xion and the second No i:
Looking over the KH3 ReMind DLC Cutscenes it is interesting how Saix redirected the Replica of Replica No i to consume the original Replica into itself.
It only started doing that because Xemnas started talking about No i then Saix noticed how she repeated Roxas’s name then decided to deliberately repeat Axel’s name rather than call him Lea just so that the second No i would continue to consume Xion which ultimately led to her consuming Xion’s Heart!
Xion was intended to consume Roxas but her copy was directed to consume her Heart instead which led to Xion being resurrected!
Naturally since Sora’s most vital memories were a major part of her she probably has holes in her memory and I’m quite certain Xigbar and Maleficent can easily taunt her with this knowledge.
The fact that her memory of speaking to Riku confirms that she resembles Kairi(whom the second No i was fighting while consuming Xion thus providing a memory to base her appearance off of) won’t fix the notion that she might have got her hair(and eye) color/shape wrong which I’m sure Maleficent and Luxu will both gloat about.
On to The Nameless Star and Yozora:
The Nameless Star that Yozora was shown trying to save in the Verum Rex Trailer was mentioned by Nomura to be a form of another character who has appeared in the series which is naturally Sora as Yozora’s confusion by Sora’s appearance despite being sent to save him proves.
As for what Yozora is: Girl-Sora’s Nobody. The guy has Nobody Earrings and is stated to have a changed appearance with his Heart replaced with another’s which is likely Verum Rex Ansem Seeker of Darkness no doubt explaining Yozora’s resemblance to Riku.
Yozora in her true form resembles Girl-Sora with White Hair which pretty much makes her look like KH2 Riku… Verum Rex Ansem probably has a fragment of himself in Riku himself explaining why Riku has Yozora’s hairstyle.
Kairi is seen using Noctis’s trademark abilities which indicates that Yozora will discover that Nobodies grow Hearts as proven by Roxas and will discard Verum Rex Ansem’s Heart into Kairi which will give her Noctis’s Hairstyle but not his gender since Kairi’s Heart is older and stronger than the Nobody Yozora’s.
Of course if Verum Rex Ansem exists then is there a Verum Rex Xemnas? Of course there is: The Master of Masters himself! The Heartless will have both of Noctis’s Voice Actors unlike his Nobody who will only have his English Voice Actor.