When someone is known for being wildly devoted to a cause or idea, they're called a firebrand. A firebrand enjoys pushing buttons and stirring up passions.

Firebrand isn't such a tough word to remember if you think of that person's "brand" being "fiery." Someone who enjoys heating up the debate around a subject or lighting a fire under other people is a firebrand. "Fire" is their "brand." Firebrands come in all shapes and sizes: conservative, liberal, militant, creative. Anyone who takes a strong, provocative stance and challenges people with heated rhetoric might be labeled a firebrand. All it takes is guts and a willingness to stir things up.

Definitions of firebrand
  1. noun
    a piece of wood that has been burned or is burning
    synonyms: brand
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    type of:
    wood used for fuel
  2. noun
    someone who deliberately foments trouble
    synonyms: inciter, instigant, instigator, provoker
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    a person who leads (especially in illicit activities)
    type of:
    bad hat, mischief-maker, trouble maker, troublemaker, troubler
    someone who deliberately stirs up trouble
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