beautiful and I'd like to hear more about him!

Pretty nifty idea. I really like it. I especially like how you introduced Zaimix, I really wish you would have introduced the rest of his abilities that way too, instead of just telling them to the reader in a short explanation. Explanations are tricky and often come out awkward and slow the reader down. I also would have liked to see the magical creatures doing stuff right next to a normal person and them not noticing, you know, something of that nature, to reenforce that only Mark and children could see them. Good luck with the rest of the story.