Final answer:
Theodore Roosevelt, known for his leadership of the Rough Riders and his commitment to conservation, is the figure depicted on the 2016 quarter for Theodore Roosevelt National Park in North Dakota.
Step-by-step explanation:
The Rough Rider depicted astride a horse on the 2016 quarter for the North Dakota national park is Theodore Roosevelt. This national park is named Theodore Roosevelt National Park in honor of his contributions to conservation and his passion for the rugged American landscape. Roosevelt was not only a keen outdoorsman and former rancher in the Dakotas but also a well-respected leader of the Rough Riders during the Spanish-American War. His legacy also includes his notable presence as part of Mount Rushmore, his commitment to America's natural history, and his receipt of the Nobel Peace Prize.