Xion is the fourteenth member of Organization XIII, to appear in the upcoming game Kingdom Hearts 358/2 Days. At the Square-Enix press conference DK∑3713, she was revealed in a trailer to wield the Kingdom Key and to have strange connections to both Naminé and Kairi.
Little is still known about her role in the game. She has now shown up twice: once in Twilight Town, where she aided Roxas and Axel, and again in Beast's Castle, where she and Riku had a verbal showdown. A recent Famitsu article has stated that she has a "tragic but yet, brave fate." Axel was quoted saying that Xion often tries to escape, and he always brings her back. This suggests that Xion is not in the Organization on her own will, but is forcibly kept a member.
Although she wields a Keyblade in the most recent video, it is unknown if this is a real Keyblade, or if, as Riku suggests, it is a fake, though some speculate that he was most likely just not willing to accept the fact that someone else could wield the Keyblade other than himself, Sora, King Mickey and (later) Kairi. Her Keyblade from the trailer has been revealed to be the Kingdom Key, Sora's original Keyblade, from many sources. Naminé also makes a reference to her while talking to DiZ, talking about connecting memories. At the 2008 TGS it was announced that at one point in the game, she steals Roxas's Keyblade. The theft may account for her revealed weapon, The Kingdom Key.
There is still no confirmation on her powers or abilities, though she's revealed to look and sound like Kairi and have black hair and blue eyes.
A screenshot in the most recent Famitsu article shows Xion in pain in Riku's arms, questioning her own existence - indicating that her fate may indeed be tragic.
- Xion is said to have ties between both Kairi and Namine, theorizing that there is a relation between the three of them.