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Instigator (Noun)

A person who initiates a course of action.

Nouns denoting people.

The young activist was seen as the instigator of the student-led protests against climate change.
Her provocative comments on social media made her the instigator of a heated online debate.
As the instigator of the project, he was responsible for securing funding and resources.
The instigator of the plan to revamp the company's marketing strategy was the new CEO.
He was often the instigator of spontaneous adventures with his friends, always looking for the next thrill.

Someone who deliberately foments trouble; "she was the instigator of their quarrel".

Nouns denoting people.

The police identified the instigator of the riot and arrested him on the spot.
She was known as the instigator of the office gossip and rumors that spread quickly.
The instigator of the fight was expelled from school for his actions.
He was accused of being the instigator of the cyberbullying campaign against his former friend.
The instigator of the plot to sabotage the company's operations was caught and fired.