Can't argue with lack of space.



Well, when he leaves the organization, he's forced to fight one of his two best friends, to the death no less, an event that would have emotionally crippled other people, but that could be because he started losing his memory of her immediately after he struck the final blow. Regardless of that fact, he was very determined to fulfill his final promise to her, and it took Riku giving in to the form of a humanoid manifestation of darkness and evil to stop him. Even before that, when he was still part of the organization, having his power being drained didn't stop him from going on potentially fatal missions and accomplishing them, with or without assistance. Also, he didn't back down from a fight with his other best friend, who had been trying to kill him, and winning said fight.



Jaune isn't really the main character of RWBY, and yet you included him. Plus, Roxas is the main character of 358/2 Days.



Now that I think about it, Ventus would be better-suited to this team than Roxas. His heart gets split in two by Xehanort, and despite that, manages to survive, albeit with help, and years later, trains alongside Keybearers older than him, as well as being able to stand on nearly equal ground with them. Even when he fuses with Vanitas, he manages to retain his own sense of self, and even defeats Vanitas within their shared heart, despite the fact that his heart would be damaged to the point that he would need to go into a coma.