Well...a dragon breathing fire, from my understanding, doesn't necessarily have anything to do with magic, but with biology and anatomical make-up. Unless the dragon breathes magic fire, or produces fire magically or something. XD Same with flight--if the dragon has wings, flight wouldn't have anything to do with magic but with biology. Unless...the dragon is so heavy and needs magic as an aid to get airborne, or it flies without wings and uses magic for flight. So...if the dragon used magic in order to accomplish these things, then yeah, it wouldn't be able to do them while in a Mordecai's presence. If it just has to do with biology and anatomy and stuff like that, it'd be fine. ^_^
Chimera...that's tricky. I'd say if the Chimera was created by magic, but does not use magic in and of itself, it shouldn't be affected. When you say magic keeps it alive, do you mean like magic is actively working inside the creature?
A summoned creature...mm...another toughie. ^^;; Um...I'm thinking that so long as the summoner isn't in the presence of a Mordecai, it would be okay so long as there is no magic in the actual creature's presence, so to speak. Or...something. XD
Hmm...communication and thought...you mean like telepathy, for instance? Telepathy is one of those really vague abilities; some people consider it magical, some consider it more metaphysical, so to speak. So I guess if your character used magic to activate the ability, the ability wouldn't work. But if it's metaphysical in nature, it'd be fine. ^_^
At least, this is my interpretation. XD