How does "xxxのオニ" equate to "xxx is bullying/picking on me"?


I was watching a cartoon that said something like:

> にいにいのオニ

Chinese subtitles said

> 妮妮欺负我

I can only guess that オニ is the same as おに or 鬼 to which jedict says:

> noun
>
>   1. ogre, demon
>
>   2. spirit of a deceased person (see also: 亡魂)
>
>   3. ogre-like person (i.e. fierce, relentless, merciless, etc.)
>
>   4. it (i.e. in a game of tag)
>
>   5. Chinese "ghost" constellation (one of the 28 mansions) (see also: 二十八宿,
> 朱雀) prefix
>
>   6. very, extremely, super- (slang) (see also: 超)
>
>

I'm still at a loss at how xxx's "ghost" could equate with - picking on or
bulling though.

If I remember correctly the person on the cartoon was answered with:

> 誰のオニ

where Chinese subtitles said:

> 谁欺负你？

Who's picking on/bulling you?

How does "xxxのオニ" equate to "xxx is bullying/picking on me"?




`A + の + B` can mean not only "B of A" but also "B as A" or "B that is A".
See: [What's the difference between 日本人の学生 and 日本の学生
?](https://japanese.stackexchange.com/q/40892/5010)

In English, one can say "You liar!", "You bastard!" and so on, instead of
saying "You are a liar." In Japanese, "にいにいのオニ!", "お母さんの嘘つき!", and such work
exactly like these -- to abuse someone -- except that the second person
pronouns (あなた, お前, 君, etc) are rarely used in such situations.

This オニ is indeed [Oni](https://en.wikipedia.org/wiki/Oni), and expressions
like this usually refer to someone who is unkind and merciless.

誰のオニ doesn't make sense to me. Maybe you have misheard something.

