Isa (KH:FTS)

Isa is Saix's original being in the canon Kingdom Hearts storyline. He is also following this role in Kingdom Hearts: For True Story as well.

Kingdom Hearts: For True Story Plot Significance
Isa serves little significane to the plot, other than the fact that Axel remember him while he was telling off Saix in front of the entire remaining Organization XIII for causing the Organization's downfall with his scheming in the first place. Isa wasn't seen, but he was mentioned as being Lea's friend, not Axel's. Afterwards, Axel went into his Final Form and attacked Saix, under Xemnas's orders.

Trivia

 * Isa was misspelled as Ias throughout the entire chapter he was mentioned in.