noun
A person who habitually causes problems, disputes, or disturbances. Used in everyday and informal contexts.
彼はクラスのトラブルメーカーだ。
He is the troublemaker of the class.
あのトラブルメーカーがまた問題を起こした。
That troublemaker caused trouble again.
問題児 specifically refers to a problem child or student, while トラブルメーカー is a broader term for anyone who causes trouble.
Loanword from English 'troublemaker'.