Isa

I haven't quite got the fine points down, like...when, or where... It just kinda kicks in whenever it wants to.
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Yes, the untapped power that lies within you. Now, child, it's time you awakened that power and realized your full potential.
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Sia is the complete being of Saix, and a close friend of Axel's complete being Lea. He will appear in the upcoming Kingdom Hearts Birth by Sleep, as a child, alongside Lea.

History

At an unknown point in time, Sia's heart was consumed by darkness, turning him into a Heartless. However, his strong will gave him the ability to continue on as a Nobody: Saix. Some time later, Organization XIII found his Nobody, who received the name Saix and was inducted into their ranks as Number VIII. It is known that he joined alongside Saïx's complete being, and the two had a secret, unknown plan. At some point during Kingdom Hearts Birth by Sleep, he has a conversation with Ventus, along with Lea.

Appearance

Sia appeared in a recent trailer for Kingdom Hearts Birth by Sleep, is wearing clothes that have a moon symbol on them. In it, he looks about the same age as Ventus.