ghost / evil spirit, demon, ogre / (figuratively) someone of remarkable or diabolical energy or ability, a demon / "it" in a game of tag/hide and seek (鬼ごっこ onigokko, "pretend spirits")

demon, ogre, monster / soul of the deceased

A demon ghost; a monster; the devil; an embodiment of evil

Demonic magic; spellcraft; sorcery / An organized body or system of magical use

(Buddhism) the practices of demons or evil spirits

magic, (especially black magic)

magic, (especially black magic) / (Buddhism) Hell

a spirit of the dead (particularly malevolent)

(rare) ox yōkai

making someone even stronger