He was a student at Hogwarts, also the Youngest seeker in the game of Quiddich and eventually the undoing of Voldermorts attempt to come back to life.
If you mean Quidditch, he is Seeker.
The role of Harry Potter was played by Daniel Radcliffe in the movies. =)
He is the protagonist
cool
great soccer player
No. Sirius Black was one of James Potter's best friends. Upon discovering that Voldemort was hunting them, the Potters' went into hiding, naming Sirius as their Secret Keeper, meaning he was the only one to know where they were. At the last moment, Sirius switches from this role with Peter Pettigrew, whom he believed they could trust. Pettigrew betrays the Potters' to Voldemort which results in Voldemort's murdering them, and pins it on Sirius.
Harry Callahan is a San Francisco Police Inspector. His nickname is "Dirty Harry" because, as he puts it, he gets every dirty job in the book.
He was. The role of Dirty Harry was first offered to Wayne but due to the language in the script he refused it. By default Clint Eastwood became Dirty Harry.
If you mean who played Harry in the first movies it was Daniel Radcliffe. Who continued to play the role of Harry for the rest of the series.
He's the main character, one of the protagonists of the book, and I don't know what you mean about 'role', but I guess it's to defeat Voldemort if that's what you mean.
Book/Movie 2. Polyjoice Potion also plays an important role in book/movie 4 and 7.
Neville has the same role as always, but he kills the final horcrux