** spoiler alert ** 
 I liked Simon and Gray (and the rest of the pack). Cormac is interesting. 
 I find (so far) the most interesting thing about this universe is the universe itself. The way everything is so separated. Wolves only mix with wolves (or perhaps they mix with other types of Weres, it isn't clearly stated), Mages (or magic users in general) only mix with their own kind, and for the most part, they don't even do much of that. They, as a group, are very isolated. Not a whole lot is mentioned about vampires yet. I mean, are they like myth and relegated to the dark? Cormac said he could eat food and he was basically like a human most of the time, he just required blood sometimes to maintain his magical levels (I'm paraphrasing here). 
 Simon seems to be under the impression he wasn't very powerful, and while some of that could be misrepresentation from his Master, or from his magic being stolen, at the very beginning he implied he was only good at two spells. Yet those compulsions he put on the humans when he made his rescue seemed pretty strong. Plus, Cormac seemed to think it unlikely Garon would be more powerful than Simon. 
 Of course, I still have questions (since it's the first part of a series, I assume they'll be covered at some point). Like, where did the demon come from, and how did it die, exactly? I have my theories, but without more information, I'm not sure. Thomas most likely stole some of their magic from the Demon, but that doesn't explain where the demon originated from. 
 Also, though the pack, for the most part, has been fairly welcoming to a Mage in their midst. Was that because of the aid he provided and the danger they were still under? With Gray now mated, will things change? 
 That Mage council seems a little hinky. I hope some sort of balance can be reached between Simon's life within the pack and his life as a Mage. This separation of different types of magic is interesting. Why? Was there a reason (historically) that the different species separated themselves? Clearly, the different types of magic are compatible.