sentences:  The staff thought that Roxas' role as a member of Organization XIII would be a suitable theme for the plot.This idea was furthered during the development of "Kingdom Hearts II", where the staff wanted to focus on what influenced Roxas to leave the Organization, which resulted in the creation of Xion's character who was connected with Roxas' origins.The development team wanted to have gameplay similar to previous "Kingdom Hearts" titles, but stated the number of buttons on the Nintendo DS was a problem.