Hermione Granger is the epitome of intelligence and how a person can use their IQ to better themselves. Born in a world much like our own, Hermione discovers that she has magical capabilities, and is sent to Hogwarts School of Witchcraft and Wizardry. A change this grand in scale might be something that would have rattled other people, but not Hermione. She struggled to adjust to a new way of life, while having to deal with bullies, and people trying to kill her and her friends. She persevered through all these struggles, and taught a generation of people to be true to themselves, and never be ashamed of the talents that they possessed. Her confidence in handling a new world so strange to her is something many people can learn from.
George R.R. Martin wrote that, "power resides where men believe it resides." In his character, Daenarys Targaryen's case, a whole army of warriors and thousands of former slaves believe that she holds the power. It isn't strange why this fictional character is a fan favorite, and why many people should take a lesson from her. When it comes ruling kingdoms, and abolishing slavery, confidence is key, and this trait is something that Daenarys isn't lacking in. Once, she was a slave herself. An exiled child, abused by her brother, and sold into marriage. But three seasons, and three dragons later, she has become a powerful queen who rules with benevolence and wisdom. The queen isn't a stranger to hardships, yet she learned that the only person who can change her circumstances is herself. She took control of the situation she was in, and created one in which she ruled. Daenarys might still continue battling for the Iron Throne, but sure enough, if confidence is the only thing you needed to win the throne, then she has it in the bag.
Donna Noble had always believed that she was a normal person. She was a temp in Britain, who still lived with her mother, and grandfather. She worked normal hours, and had a normal life. But through her adventures with an alien from outer space, Donna realized that normal people could do extraordinary things. And that is exactly what she did. She saved the lives of thousands of people on Earth, solved crimes, and defeated evil space aliens. All these things she did with a sense of humor, and kindness. In the end, Donna Noble was indeed just a normal person, but like many people, she learned that, that shouldn't stop her from helping other people, and doing amazing things with her life.
Marvel has a reputation for creating extraordinary superheroes. They created the Hulk, a man who could transform into a giant green monster. They created Ironman, a genius billionaire who saved the world with his metal machines. They even created Spider-man, a teenage boy who, after being bitten by a radioactive spider, saves New York countless times. But the most remarkable superhero they created was not a mutant, a genius, or a radioactive hero. The most remarkable hero they created was a normal man with a good heart. It's true that Steve's strength and superhuman capabilities did in fact come from a small bottle. But his speed and strength are not the things that make him special, and those things were not the reason he was chosen for the super soldier project that created the great Captain America. It was heart, and the confidence he had in himself that he could help people, even in his own small way. He taught people to believe in something greater than themselves, and gave them the confidence to do something to make the world a better place.