proxy
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an advocate
I believe you are thinking of an ambassador.
A person that represents others can be called many things; a person that represents your company is called an agent, a person that appears at a meeting in your place and casts a vote is called a proxy, and a person that pleads your case in front of a judge is called an attorney or advocate. It depends on the situation.
A conflict is a disagreement with another person. I imagine you have had a conflict with your mother at some point.
A person who says one thing and does another is called 'hypocritical'.