Board Thread:Questions and Answers/@comment-5693502-20141219175924/@comment-3045936-20141225020436

In Japanese and especially Shintoism, Samurai name their swords which contain their battle souls. This reflects with Zanpakutou. I believe Zanpakutou are keys to the inner battle spirit, that all pluses have. Nimaiya's creation is the pure vessel or vehicle to let the inner spirt to physically manifest, and overtime bonds with the true soul.

Like Shinigami are the consciousness and Zanpakutou are the ID or subconscious.