a) A book that reminds me of Harry Potter would have to be Carry On by Rainbow Rowell. I made this connection because both books are set in a school of wizardry. Both deal with mainly magical elements. Just as Harry Potter is the chosen one and needs to defeat Voldemort, in Carry On, Simon Snow is the chosen one who needs to defeat Humdrum.
b) I choose Hermione, especially the scene where she was put in a situation to choose between the right and the wrong. She is a girl of immense intelligence, whom I see in myself, and this often puts us in situations where we need to put this intelligence to use. If she hadn't chosen to help out, Harry and Ron wouldn't have passed the tests to get the Philosophers Stone. I could relate because I regularly give advice and support to my friends.