Depending on the relationship that the beholder has with Xion, she usually resembles Kairi, but has been known to also bear the faces of both Sora (to Roxas and the author of Secret Report Day 255 (assumed to be Xemnas)) and Ventus (to Xigbar), as well as a hooded doll (to Saix). It is largely unknown what others perceive her to look like - Namine once told Riku that her 'face was originally blank'.
2. A character of Kingdom Hearts 358/2 Days who has struck fear and hated into the heart of rabid AkuRoku fangirls, as she appears to have some kind of romantic connection to Roxas (particularly in her death scene).
3. The death knell of AkuRoku.
2. "Why can't we have our 358/2 Days of AkuRoku without that stupid fool? Why does Square Enix wants to break our dreams of love between Axel and Roxas? Why is Xion existing?!" - AkuRoku fangirl
3. "No. 14 Xion: Ruining any shred of AkuRoku's canonicity since May 30, 2009" - Roxas/Xion fan
She takes the form of many people connected to Sora, taking the appearance of herself to many characters, Sora to Xemnas, and later Roxas just before her death, Ventus(Ven) for Xigbar, and a hooded puppet to Saix.
After dying in 358/2 Days, she has made a small appearance in Birth by Sleep during the secret ending and Re:Coded. Her most recent appearance was in the 3D trailer, where she is shown holding her Keyblade up to Roxas in CGI graphics.
Inside the fanon she is one of the most debated characters in the fandom. Many debate her existance in the fandom, calling her a Sue.
1)She weilds a Keyblade
2)She's the 14th member of Organization XIII
3)She's a replica of Roxas with Sora's memories looking like Kairi
4)She is able to destroy Akuroku and Soriku(explained later)
Xion is also paired with many characters in both het and Yuri pairings. Namely:
Many Yaoi fans and pre-358/2 game players are against her existance in the game, and she is both loved and hated by all fans. Everyone has different opinions on her role in the game.
"Xion get's in the way of Akuroku and should die!"~The words of an Akuroku fangirl
"Xion is an amazing character who adds depth to the story."~A Xion fan.
"Xion belongs with so many guys in the series."~Various Xion het pairing fangirls
Friggin Mary-sue!!! Honestly, she's a combination of Kairi, Roxas and Sora... some even believe she's like other characters.
She cockblocks Akuroku and practically ruins it. All of the Akuroku fangirls are VERY disappointed, and angry.
Some say there is a romantic connection between Roxas and Xion, especially in her death scene where Roxas says "Who will I have Ice-cream with?"
Others say there is a connection between her and Axel, because he chooses to save her instead of Roxas. (It's in the talk with Saix)
There's also one thing I figured out... You know how she's a puppet? And the first one they've made? Her name is No.I
Xion. Take away the X, No. stands for Number, and I is roman numeral for one. MARY-SUE GODDAMMIT.
Damn you Xion. You just had to come along... and ruin it all.