Like his Nobody Saïx, 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. Isa values his friendships as he became Saïx again to locate a female friend that he and Lea made when sneaking into Radiant Garden's castle. He and Lea even became apprentices to Ansem the Wise in order to free their unknown friend. It is revealed in secret reports that this was one reason Saïx and Axel worked to have Saïx rise in the ranks of the Organization after Isa and Lea became Nobodies, which was to locate their missing friend.

Voice type: https://www.youtube.com/watch?v=z_XO9zEs1Yk