Most important person.?
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GOD, DO I EVEN NEED TO GO ON
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FDR\nGoogle him. \n\nPublic Works\nLongest Administration, invariably he had the longest time to do most of the (good) works he is credited for, and we enjoy the effects to this day.
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Albert Einstein of course
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Confucius.\n\nThanks for the easy 2 points.
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Jean Luc Picard all the way!!  He was a man who just commanded respect from everyone he encountered.  He was a man so in control of himself that his crew trusted him without question.  Respect is always the most important aspect of a leader.  Picard earned the respect of everyone.\n\nRemember when Worf got mad at him and said - "if you were any other man I would disembowel you right here."  I think that says it all.
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Any political or religious personage.
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Nelson Mandela.\n\nEven though he is retired, I can't think of anyone who commands as much genuine worldwide affection and respect.
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Charles Darwin\n\nIssac Newton
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God is more important because without him I can do nothing.  So in order to think or feel anything about anyone I first have to wake up each morning and without God I can't do it.  God is my everything!  He'll be with me when no one else can.
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Bill Gates.\n\nNo question about it. Fully documented.
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Jesus.\n\nHeb 12:2\nLooking unto Jesus the author and finisher of our faith; who for the joy that was set before him endured the cross, despising the shame, and is set down at the right hand of the throne of God.
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bill clinton\n\njfk\n\nfdr
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Ferdinand Marcos!\nKidding.
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Quite a subjective question, but one genuinely good attempt at answering the  question is Michael Hart's 'The 100: A Ranking of the Most Influential Persons in History'.\nHe ranks Prophet Muhammad (pbuh) as No.1.
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There could/would be as many different answers as there are people. One person who is important to me could not even be known of by others. Plus you have to take into consideration culture and when and where and how a person lived and who was influential at that time, etc.
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Ben Franklin.  Ahead of his time, creative in multiple fields from science to diplomacy, apparently a great conversationalist.\n\nThis is a fairly common question, but a great one nonetheless when the person can be dead or alive. Another version of the question asks you to name 3 people, dead or alive, who can come from different historic times.  Would be fun to pair up Franklin with Da Vinci, for example.  Hard for me to choose the 3rd one, though.  If I had to choose, I'd also invite Shakespeare, but there are many others.
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Sauron,\n\nYou should be whoever you are happy being, and true to yourself, without harming others.