WARNING: MINOR SPOILERS TO BIRTH BY SLEEP
Marluxia approached Xigbar, who was sniping Heartless on one of the balconies in the Castle That Never Was. "Boom, head-shot." The Sharpshooter chuckled.
"Xigbar, may I ask you something?" Number XI inquired.
Bang! "Sure thing, flower-power."
The entire Organization had learned to ignore Xigbar's bizarre nicknames. "I was curious about how you received those scars of yours."
"Fell down some stairs."
Marluxia raised an eyebrow. "Really?"
Bang! "As if!" He turned halfway around and pointed at his eye-patch. "Got my scars and lost my eye against some punk keyblader ten years ago. He got a couple of lucky shots in. I beat him up more for it."
"There were keyblade weilders before Sora?"
"Hell yeah there were!" Bang bang! "Tons of 'em! Then something or another happened and now there's like, three left." Bang! "Things were more exciting back then, too. Things called the Unversed runnin' around and causing havoc, a big ol' war that spanned multiple worlds, hot chicks that knew how to fight and weren't sadistic or Poppet, and-Hey! Where're you going?!"
Marluxia waved goodbye as he walked away. "I guess those grey streaks in your hair aren't just for looks!"
I'm not sure how much of this is actually accurate, as I'm going off scattered info on the game.