It could depend on the context. If they were working in a company where they knew wrong things were being done and decided to go public, they could be called a whistleblower. If they are someone standing up against wrongdoing in society or a government, they could be a campaigner. Others might see them as a revolutionary. There are lots of terms, but the context and perspective can determine which is more appropriate.
Surveyee
You could call such a person a liar; you might also say that such a person is given to hyperbole.
Often paraphrased as "Walk the talk" or "Practice what you preach": let your behavior back up what you say. Having lunch in separate VIP room speaks louder than saying "We are one family." Picking up on suggestions speaks louder than saying "We need more innovative ideas." Diversity in top management speaks louder than saying "We need to respect different points of view."
It means there's no argument -- when whatever is going to happen to you is ready to happen, you can't do anything about it. "Your number is up" often refers to death, so when you die, you're dead and nothing you say or do can stop it. The number refers to the practice in many businesses of assigning numbers to customers so that they can call out the next person in line. That person's number is "up."
its a way of saying hello but you use it more on the telephone than in person. its to respond to the call. so you wouldn't go up to somone and say it. its like say "hows there" to them
I think it's proxy
blunt, straight-forward, rude
Understudy
You call them a Pyromaniac.
I would call them a role model.
A person who sets up an event is called a party planner
compulsive person
A warmonger!
An idiot.
Surveyee
A roadie.
Hi: Mouth-guard. Of course, in slang, it's an attorney or someone who speaks up for another person.