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Ruby is a student at Signal Academy who is admitted to Beacon Academy two years early to train to become a Huntress at the beginning of the series. She is very cheerful and optimistic, but a little socially awkward and somewhat fixated on her weapon, Crescent Rose. She is partnered with Weiss, and is the leader of Team RWBY. She was trained by her uncle, who helped her design Crescent Rose.

Ruby's weapon, Crescent Rose, is described as a "high velocity sniper-scythe". As this suggests, its a large scythe that also fires high-caliber sniper rifle ammo. In addition, its blade angle can change — usually relative to Ruby's momentum — effectively turning it into a war glaive (a polearm with an inwardly-curving sword-like blade on the end).