Winter Schnee

Winter Schnee is Weiss Schnee's elder sister, and is first mentioned in "A Minor Hiccup". Beyond this, not much is known about her, aside from her affiliation with Weiss.

Because an employee with the Schnee Dust Company offers to forward her to her sister, it's possible that she works at the family company.

On August 7th, 2015 during the RTX 2015 RWBY Panel, it was revealed that Elizabeth Maxwell will voice Winter Schnee. Concept art for her character design and outfit were also revealed.

Abilities And Powers
Winter shows great skills with her weapon, displaying above-average speed, agillity and reflexes in combat.

Winter's semblance is similar to her sister's, Weiss Schnee, being able to create glyphs. The effect these glyphs have is currently unknown.

Trivia

 * She was first alluded to in "The Badge and The Burden, Pt.2", when Weiss told Ruby Rose she always wanted bunk beds as a kid.
 * Winter shares her last name with Weiss, which is German for "Snow", following the color naming convention on Remnant.
 * Winter is one of the four calendar seasons, usually characterized by a cold weather, often accompanied by snow, further tying her entire name with her color motif.