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Funnily enough, they are called a starter.
The person who starts a religion through the commandemnt of God is called a Prophet.
A trigger Incident is basically what starts the story.
A person who starts an organization is called its founder.
Here it is in order "BLOOD" "BLOODSTAINED" "TRIGGER" "SLOWLY" "SLOWLY" "STARTS PULLING" Hope it help and it's my first time answering =)
an entrepreneur
starter person
Artisan
A trigger Incident is basically what starts the story.
Aviator
loquacious
Could be buffoon.