Orsenna is a Sylvari Thief of mine who has roots within the story I created separately from GW2.
However, she seems to have really come together for me in GW2.
Orsenna is a bounty hunter who hunts other Dryads - in the other story. In GW lore, she hunts Mordrem and Nightmare Courtiers. Sylvari who have become corrupt. She's part of a small guild along with another Sylvari named Megaera. Megaera's guild is dedicated to eradicating all Sylvari-based threats, and Megaera is frighteningly dedicated to it.
Orsenna is a no-nonsense Sylvari who's lost a lot of things she once held dear because of Sylvari corruption. She's lost too many friends to the Nightmare Court and Mordremoth for her to ignore the Sylvari and Mordrem who pose a threat to Tyria.