不ふ思し議ぎちゃん

noun

eccentric young person (esp. girl); oddball girl

Colloquial, often affectionate or teasing term for a girl or young woman who behaves in a quirky, unpredictable, or dreamy way. The male counterpart is 不思議くん.

See also: 不思議くん

• 彼かの女じょはいつも突とつ然ぜん歌うたい出だす、いわゆる不ふ思し議ぎちゃんだ。

  She's what you'd call an oddball girl—she'll suddenly start singing out of nowhere.

• クラスに一人ひとりは不ふ思し議ぎちゃんがいるよね。

  There's always one quirky girl in every class, isn't there?