Ghost Warrior in Chinese / Japanese...

幽靈戰士 means Ghost Warrior or Ghost Soldier in Chinese.

This title is used for at least one movie and a video game (about a sniper).

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.

戦士魂 is “warrior soul” or “warrior spirit” in Japanese.

Here's the breakdown of the Kanji:

戦士 (senshi) warrior; soldier; combatant; fighter.

魂 (damashii/tamashii) soul; spirit; can sometimes mean “ghost.”