Three of the most well-known allies in Harry Potter are Ron Weasley, Hermione Granger, and Rubeus Hagrid.

  Rubeus Hagrid knew Harry when he was a baby and was the one to give him to his relatives. He told Harry the real reason behind his parents death and his scar. Hagrid helped Harry find out what he was destined to do, go to Hogwarts School of Witchcraft and Wizardry. From then on, he has helped Harry in situations and other problems through out the movie. Hagrid may also be considered to be a bit of a mentor to Harry, too.

  Hermione and Ron are his best friends. Those two and Harry were all sorted into the Gryffindor house and, therefore, did everything together. The trio, Harry, Ron, and Hermione, were always by each others sides, especially in times of need. Harry and Ron saved Hermione when she was being attacked by the troll, Ron and Hermione helped Harry when his broom got jinxed during the quidditch match, and all three were in it together on trying to look for and save the Sorcerer's Stone.