Tondi Dayon

 was a girl from Gatan who lost her mother, Parnia, in the City of Radiant Stone. The Thirteenth Doctor, Ryan, Yaz and Graham promised to help find her mum.

With her taking a shine to Yaz, the two worked together to help her find Parnia, although this meant that Yaz had to split up from her friends and work on her own. Running through the destroyed city and narrowly avoiding a group of drunks, Yaz learned that Tondi's aunt lived nearby, and the two attempted to find her for help. (COMIC: The Warmonger)