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See also: Bushido - Code of the Samurai Warrior
鬼武者 is an unusual title that can be translated two ways, daredevil warrior or demon warrior.
The most common is probably the daredevil warrior. However, the first character means demon, ghost, or soul of the departed. Therefore, it can mean the soul of a warrior or a demon warrior.
This title is Japanese only, and should not be used if your audience is Chinese.