Nevertheless, that didn’t stop the internet. Barnes was the go-to cast choice to play a younger version of Harry’s godfather, Sirius Black, who was played by Gary Oldman in the movies.

SEE ALSO: 5 articles that'll only make sense to true 'Harry Potter' fans In particular, Thériault had some thoughts about how Molly Weasley and Sirius Black are portrayed in the series' fifth book.