Yrro is thought to be one of the Jjaro, although this is not known for certain. In an interview with Chris Geisel, it was stated that S'boath and S'bhuth are alternate spellings, just as Yrro is an alternate spelling of Jjaro, leading to the belief that Yrro was actually the entirety of the Jjaro race, and that Pthia is another race altogether.