Selucia was given to the Empress of Seanchan as a baby, and spent the first twenty-five years of her life training for the job of nursemaid and guardian to the Empress' child, who turned out to be Tuon. She also secretly trained in fighting and defence, to be a bodyguard that no one knew about and no one would suspect. She is described as average height, bosomy and creamy-cheeked, with blonde hair.
For the first sixteen years of Tuon's life, Selucia acted as a guardian. When Tuon reached adulthood, Selucia was presented with two traditional gifts - a sack of gold for every time she'd had to punish Tuon, and her choice of her next placement. It isn't clarified if this means another service post, or if Selucia could theoretically have been freed and even given high status. In any case she chose to stay with Tuon, acting as her chief maid. Tuon was delighted, and made Selucia her so'jhin.
As a mark of her status Selucia has the left side of her head shaved, and her remaining hair twisted into a braid. She has a keen sense of propriety and is horrified by the thought of overstepping her station. But as so'jhin to the Daughter of the Nine Moons, Selucia is superior in status to the Low Blood, and possibly equal to the High Blood. Selucia is wholeheartedly devoted to Tuon, is often found with her Mistress, at least in public, and when Tuon is kidnapped from the Tarasin Palace, Selucia interferes and manages to accompany her.
Since Tuon became Empress, Selucia has been named as her Truthspeaker.
Read more about this topic: Minor Wheel Of Time Characters