Translation guide
The person who leads a group, especially in a negative or illegal activity. In Japanese, the most common word is 首謀者 (shubousha), but other terms exist depending on context.
The main person responsible for planning or leading a crime, protest, or troublemaking.
The standard term for the ringleader of a crime or plot. Often used in legal and news contexts.
The police arrested the ringleader of the fraud case.
Refers to the main perpetrator or principal offender. More focused on the act than the planning.
He is believed to be the ringleader of the robbery.
Literally 'black curtain'; refers to a hidden mastermind or person pulling the strings from behind the scenes.
The ringleader behind the incident hasn't been caught yet.
The person who originated or is responsible for something, often negative. Can be used for a ringleader, but less common than 首謀者.
He is the ringleader of the disturbance.
The kid who leads a group in mischief or play, often with a negative connotation.
首謀者 emphasizes the planning and leadership role. 主犯 focuses on being the main perpetrator of the crime. 黒幕 implies a hidden, behind-the-scenes manipulator.
Do not translate 'ringleader' literally as リングリーダー; it is not used in Japanese. Use the terms above depending on context.
He was the ringleader of the kids when he was in elementary school.