Dame Maggie Smith "The last couple of years have been a write-off, though I’m beginning to feel like a person now,” she said. “My energy is coming back. S*** happens. I ought to pull myself together a bit.” Harry Potter
Hagrid is probably the single most important person in Harry's development. He gave him self-worth, showed him that someone who makes serious mistakes can still be a good person, and taught him loyalty beyond anything Harry would ever see.