不思議くん
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Meanings
1
eccentric young man; oddball guy
Casual, often affectionate term for a young man who is quirky, unconventional, or hard to understand. Compare 不思議ちゃん for females.
See also: 不思議ちゃん
He's the class oddball, always making off-the-wall remarks.
That eccentric guy suddenly starts talking about philosophy, which is interesting.