thegames might be a good fit for Riley. We've got castmates there (Tess and Joel) and other survival-zombie canon people in troves. It's medium paced, set in Panem from the Hunger Games, a mix of survival/horror, politics, rebellion stuff, and pageantry all mixed together. Characters are reaped to Panem to serve as Tributes in the 'Neverending Quell" where they fight to the death in Arenas, only to be revived a few days later and made to repeat the process. We have a Test Drive Meme up right now if you're interested!