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Thea Diggory is younger sister of Cedric Diggory. She is in her fifth year at Hogwarts. Thea is nice and lovable person. Cedric is very protective of her and in his mind she is still his baby sister even though she is not a child anymore. Thea starts getting closer with Fred and George, one more than the other.

[Fred Weasley]
[Harry Potter Movies]