Hermione Granger

the nerd bookworm know-it-all of a friend of Harry Potter's and Ron Weasley's in the Harry Potter series. She quite frequently knows all the answers in classes and is a master of the art of wandwaving.

Also the word to describe someone heavily obsessed with the Harry Potter books who also happens to be a psychotic know-it-all.

"Did you see that girl at the midnight showing of Harry Potter and the Prisoner of Azkaban?"
"The one who was correcting everybody because they were saying ridiculous instead of riddikulus?"
"Yeah, she was a real Hermione Granger."

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