I just realized something. Kingdom Hearts takes place in Creation.

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Key Blade wielders are Solar exalts. The Key Blades are Glorious Solar Sabers, Strike Raid is Iron Raptor Technique, and the blasts they can shoot out are Blazing Solar Bolts, etc. Sora's a Dawn, Riku has Terra's exaltation shard, which became corrupted and is now being redeemed... The Key Blade War was an apocalyptic battle between the various Exalts that shattered Creation, leaving only scattered pockets of existence, which is the various worlds you go to.

Mickey, Donald, Goofy, etc are all Beastmen or have Wyld Mutations. Nobodies are high essence ghosts, Heartless are demons/akuma.