Yang Xiao Long - Yenra Picture Wiki
Yang Xiao Long, the fourth member of Team RWBY, is a yellow-haired girl and, at 17 years of age, Ruby's older half-sister.
She wields twin shotgun gauntlets called Ember Celica. Her Semblance works on a "recoil-based system": whenever Yang takes a hit, her strength, toughness and striking power rise in proportion to her injuries. Her glowing hair and eye color change are caused by excess energy from the buildup, which also results in Yang often acting very "hotheaded" in battle.