I just read up on some Information about Squall (Leon) in the game Kingdom Hearts 1 + 2 and I found out something about him on the ending Credits of Kingdom Hearts 2!! He'll probably be in the third game too if it comes out!! WOO!!
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Squall also appears as a non-player character in Kingdom Hearts, although his look has been redesigned and he goes by the name Leon (though Yuffie occasionally refers to him as Squall, much to his annoyance). He assumes the name Leon because he was unable to protect those he cares about from the Heartless when his world was consumed in darkness. He would go by his real name once the Heartless are defeated for good and his world restored.
In the game his role is to help to guide Sora, the lead character, on his battle with the Heartless with various other Final Fantasy heroes. While his appearance is changed and it is notable that he seems older, his personality remains confrontational and rude. Of the Final Fantasy characters in the game Squall has arguably the largest role. A memory-based version of himself appears in Kingdom Hearts: Chain of Memories. He is to return in Kingdom Hearts II, wearing his Final Fantasy VIII attire. He also a partner of Cloud Strife who joined forces with him in the Hades Cup, and in Kingdom Hearts II. Leon is voiced by David Boreanaz in the English language version of the game and Hideo Ishikawa in the Japanese version. In the ending credits of Kingdom Hearts II, Squall opened a letter that seemingly came from Rinoa due to the wing-insigna. Like in Kingdom Hearts, Leon does not play/do Lionheart. When he transform his Gunblade to that Huge Blue Sword, it doesn't count. That actually is Cloud's Ultima Weapon. Cloud does not play/do Omnislash. That Metamorphosis doesn't count as Omnislash. His new power is Sonic Blade as well.