The Blonde Queen of the kingdom of Gi and a General of the Kan empire. Sōsō likes beautiful women and likes to tease her subordinates, especially her strategist Jun'iku, but is also attracted to Kan'u. In fact, a famous scene in the first season's closing credits shows her "kidnapping" a dining Kan'u and then kissing her while inside a private bedchamber. Kan'u was later returned to the dining table with the rest of her friends, albeit covered in kiss marks and quite shaken. A brilliant ruler and military genius, she also isn't afraid to speak her mind in any situation if she doesn't like it. Despite being seen as a little cruel and calculating, she is in reality an honorable person. Sōsō also doesn't like being denied what she wants, and vows to get Kan'u in her bedchamber.
In Shin Koihime Musō, she is also revealed to be an excellent chef.