In Kingdom Hearts II, Saix's never given a person to match up with as his somebody. The rule of the Organization is that they place an "x" in your name to become a Nobody. Saix with out an "x" can be any of the following names:

- Sai
- Sia
- Sai
- Sia
- Ias
- Isa

HOME WORLD: Radiant Garden
PERSONALITY: Like his Nobody Saix, Isa is much quieter and more mature than his companion, Lea, with a similar speaking tone. He has no interest in fighting on Lea's side in a childish challenge, but is shown smiling as Lea and Ven fight. He is shown having a more carefree personality compared to his Nobody and values his friendship with Lea. He also has a comical side, as he jokingly tries to forget about his friendship with Lea. He is rather sarcastic and doesn't hesitate to mock Lea after he loses his fight with Ventus, though he does so jokingly.

"A serene and self-possessed boy who always has time for a quick quip at his best friend Lea's expense. " - Square Enix

Isa is the original persona of Saix, and a close friend of Lea, Axel's original persona. He appears in Kingdom Hearts Birth by Sleep, as a teenager, alongside Lea. At an unknown point in time, Isa's heart was consumed by darkness, turning him into a Heartless. However, his strong heart and 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 VII. It is known that he joined alongside Lea, and the two had a secret, unknown plan.

1. "Lea, we don't have time for this."
2. "From where I stood, the only thing you drew was a big L on your forehead for "Loser"..."Lame", "Laughable"..."
3. "Oh, you mean I was supposed to lie."
4. "What is it with you and picking up stray puppies?"
5. "I know I won't forget you. Believe me, I try all the time."

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