Drishtadyumna was Draupadi's brother, born from the sacrificial fire along with her. He was destined to avenge Draupadi's humiliation by killing Drona, which he accomplished during the Kurukshetra war. He was the king of Panchala and a skilled warrior. Shikhandi was actually Draupadi's sibling too but in a different context - reincarnated as Amba.