Ghost Demon in Chinese / Japanese...

鬼 can mean ghost, ogre, demon, or “spirit of a deceased person,” in Chinese, Japanese Kanji, and old Korean Hanja.

In some context, it can also mean sly, crafty, ogre-like person (i.e. fierce, relentless, merciless, etc.)

This can also be the “ghost” constellation (one of the 28 mansions in Chinese folklore).

An extended list of meanings includes departed; dead; a disembodied spirit; dead person; evil being; hungry ghost.

妖魔 means demon in Chinese and perhaps slanted toward ghost in Japanese.

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.

妖怪 is a Chinese, Japanese Kanji, and old Korean Hanja word that can be defined as a devil, ghost, apparition, phantom, specter/spectre, demon, monster, or goblin.