Rubeus Hagrid is one of Harry Potter's best friends. He's the half giant gameskeeper for Hogwarts that loves animals of all shapes and sizes.
Hagrid was a student at Hogwarts back when Harry's father, James, was in school. In Book 1, Hagrid is the gameskeeper that raises cute dragons and cares for all sorts of animals. He is the one that cares for the 3-headed dog that guards the stone.
By Book 2, you learn that Hagrid was expelled because they thought he was helping the "monster" from the Chamber of Secrets. Harry learns that really Hagrid just liked a giant spider at the time, and it was because of Tom Riddle that Hagrid was kicked out.
By Book 3 and 4, you learn that Hagrid is a half-giant, and that his mother, the giant, ran off into the mountains. He wants to learn more about his giant roots and his parents.
In Book 5, Hagrid has indeed gone to the mountains to meet up with giants, and learns his mother is dead. However, he does track down his half-brother, a giant, who he tries to tame and teach English to. He also teaches some courses, although he is told to leave by the new Inquisitor who feels he is not an adequate teacher.
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