I'd say dragons always have a hint of Air too, making them more likely to be okay with air mages and elves, despite any other elements they may have. 


So, my old dragon who was alive during the war between dragons and humans, before the dragon riders came in existence, will make an appearance in my next post. His size is comparable to RedClaws and Ark, maybe slightly bigger.  
I think it was mentioned in the RP that Ark is slightly smaller than RedClaws. And Mercury is smaller than Ark. I think Fiona will be roughly the same size as Mercury.

And Comet is small, I recall in the other setup it was mentioned she is similar in size as Toothless. And Orion somewhere between Comet and Mercury, right?

Another small dragon will join the party soon too, she is on her way and she will be a great playmate for Aero. She's a fairy dragon, her torso has the size of a human hand, and she's a friend of Mikhal.