Fwi-Song had a career as a circus freak before becoming a palace pet on a Megaship. He then became an adherent to a popular religion on another Megaship before founding the Eaters prior to the destruction of Vavatch Orbital during the Idiran-Culture War.
As the Eaters prophet, he ate Twenty-seventh after the latter attempted to escape the impending destruction of Vavatch on a Culture shuttle. Fwi-Song was poisoned while eating flesh stripped from Horza's fingers. The prophet then collapsed and crushed the disciple First.
At his death, Fwi-Song was extremely obese and resembled a pyramid of flesh. He used different sets of artificial teeth.