The current emperor and his own direct family (wife and son) are OK people who are friendly with the Salvatores and respect them; the problem is Medea's power and influence as Empress Dowager (which puts her above the emperor and hamstrings him somewhat) and her own devious plotting. Also, the mentioned prince Arendo is a nasty twit just like Eli; he's Medea's biological son (with the last emperor), not the current emperor's son (that boy's much better). In fact, Medea will be the main villain of the story's next half, while the Sperados become sub-villains.