おに

ogre, demon, 'it' (e.g.,in a game of tag)

Also:spirit of a deceased person, ogre-like person (i.e. fierce, relentless, merciless, etc.), it (in a game of tag, hide-and-seek, etc.)

What does mean?

is a Japanese noun meaning ogre, demon, 'it' (e.g.,in a game of tag) in English. It can also be translated as spirit of a deceased person, ogre-like person (i.e. fierce, relentless, merciless, etc.), it (in a game of tag, hide-and-seek, etc.) depending on context. It is written as in kanji, おに in hiragana, and oni in romaji. This word is part of JLPT N3 vocabulary.