Roxas wielded the keyblade right handed.

Another boy had wielded the keyblade right handed. Another boy, empty and drowning in darkness, another boy with an astonishingly close connection to Sora. That boy, too, had been torn from where he belonged, where he was whole, and the bitterness and anger consumed him.

It nearly consumed Roxas as well. However, Roxas didn't just wield the keyblade right handed. When she died, something rose inside him, something that would do anything to protect a friend.

That something (someone) was left-handed.

You see, there had been another boy that was stripped of who he used to be, who was nearly consumed by darkness, yet another boy with an equally strong connection to Sora. That boy, against all odds, had been kind where he should have been bitter, gentle where he had every right to be angry, and that gentleness was not gentle at all; it defended more fiercely than any darkness ever would.

And Roxas drew strength from them both; strength from the bitterness and hatred, and strength from the kindness and gentleness that had saved them all so many years ago.

A small, almost unnoticed part of him wondered what, exactly, Xemnas had meant when he named Roxas "Key of Destiny."

(A small, almost noticed part of Xemnas wondered the same.)