Sailor Pegasus is the defender of the dream world called Elysion. She is also sister to Usagi Tsukino, who is Sailor Moon and Queen Serenity of Earth. Sailor Pegasus' gain her power and trained under Helios, who is also the protector and guardian of dreams, and Sailor Pegasus is to help Helios along side. Sailor Pegasus owns a Sword by the name of Saphira Blaze, who's power rest only in the hands of Sailor Pegasus.
Reference Picture is a close-up. Also look at Avatar.