S'ira was a Weequay member of the Revengers, a group opposing the Crimson Dawn criminal syndicate, alongside Ankala Sahm and Tanka. Like the other members of the group, S'ira's village had been destroyed by Crimson Dawn. On Calior, S'ira and the other Revengers were recruited by the Sith Lord Darth Vader as part of his own quest to destroy the syndicate.