>>104040914Kingdom Hearts is in its core, a story of a man who forsake all ties for power, and a boy who forsake all powers for ties.
Xehanort betrays and corrupts, and overwhelms all those whom he feels connections to, to control their timelines, destinies and power. He uses the Keyblade of another he well and likely took by force.
Sora connects to his friends and uses their power as his strength, his weapons, allies, and powerups are all about someone giving him strength. He uses a Keyblade that chose him rather than one he took or inherited, even when Aqua gave him the potential.
Xehanort is all about the reduction to one. Sora is all about the expansion to everyone.
Insert the machinations of a million different events around that premise.