Virgos are an earth sign known for their helpfulness and strong opinions on how to get things done. They are hardworking and organised, and exactly the sign you'd want to work with on a group project — that is, if they didn't just go ahead and finish the whole thing before the group even met.
Aside from the fact that her birthday falls on Sept. 19, which puts her squarely in Virgo territory, Hermione Granger is the total embodiment of Virgo energy. She is particular, smart, and a bit of a perfectionist.