Hagrid > anyone else.
He was the only one who cried real tears when Dumbledore left baby Harry at the Dursley's.
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And he was the first person EVER to properly celebrate Harry's birthday.
HE EVEN BAKED HIM A HOMEMADE CAKE.
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He was there for Harry's first experience in the wizarding world.
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And like any parent with a soft spot for animals, he bought Harry his first pet.
HEDWIG.
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Proof Hagrid Was The Greatest Father Figure In The "Harry Potter" Series