To dualize is to fuse with NiGHTS, and allows your bodies to assimilate with one another.

According to the Nights into Dreams (Comic), when a visitor dualizes with NiGHTS, they will trade places, with the visitor taking on the abilities and appearance of NiGHTS, and NiGHTS taking on the abilities of the visitor, and looking like them, even giving NiGHTS the ability to enter the waking world in the visitor's body.

However, in NiGHTS: Journey of Dreams, the visitor and NiGHTS share NiGHTS' body, but both personalities can interact with each other, and control NiGHTS' body.

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