Hogwarts: Who uses a crowbar in wizard duels?

[Single female lead Hermione + based on the movie plot, with later plot changes + system]
Kevin travels to the world of Harry Potter and grows up in an orphanage, but has never been exposed to magic until he is 11 years old and finally receives his Hogwarts acceptance letter.
Having been given a second chance at life, he only wanted to enjoy this fantastical magical journey, but as time went on, he inevitably became more and more engrossed in it...
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Snape: Kevin? Hmph! Just a spoiled brat with a bit of talent.
Dumbledore: Kevin is such a good boy, always ready to go to great lengths for his friends.
Voldemort: Kevin, that despicable scoundrel who has no sense of witchcraft! He's attacked me with a crowbar every single time I've died!