Prince Oswain is one of the three living heirs to the crown of Kashar, alongside his brother Warlord Kyar and sister Princess Megara. Notably, he is the only one of the three who did not visibly engage in the Kashari slaving campaigns against the cities of Sapience. Oswain is known by many as "the Madman"; the hatha-yin maiden Kavaya was quoted as saying that he appeared to her but once, briefly, and that she "[did] not care to repeat the encounter."