Who Are A Few of Your Favorite Founding Fathers? You can include Abigail Adams if you so prefer.
Top of my current list of well know ones are: John Adams, John Marshall, Hamilton, Madison...
The why will come later as will names of some not so well known ones
Washington, Jefferson, Madison, Monroe, Franklin, Hamilton.
Washington was called the one indispensable man of the Revolutionary generation (coined by Jefferson). No one disagreed with him.

No victory over the British....no Constitutional Convention...and no Presidency as we know it without him.
Madison is called the Father of the Constitution and with good reason. He put forth the Virginia Plan that was largely adopted into what is now our current system of Government. One of the main authors of the Federalist Papers (along with Hamilton and to a much lesser degree John Jay). A key supporter of the Bill of Rights. A leading voice in the early Congress.
Jefferson where to begin. Declaration of Independence is probably the greatest political paper in history. A major figure in advocating for Religious Freedom....(See Statutes for Religious Freedom: Virginia). Founder of the University of Virginia....Louisiana Purchase.....you get the idea.
Monroe: Revolutionary War hero. Wounded and nearly died in battle. Served at Valley Forge with Washington. Crossed the Delaware. Negotiated the Louisiana Purchase. One of the best Secretary of States in U.S. History. Formulated the Monroe Doctrine which is still U.S. Policy. Only man to serve two cabinet positions at the same time.
Hamilton: Revolutionary war hero. Main author of the Federalist Papers. Financial genius. Saw America as a manufacturing power long before anyone else.
Franklin....brought France into the war on the side of America. Without France, we probably lose. Brilliant writer and thinker.