Marble

Marble is perhaps the most qualified of the ambassadors. Her connection to her element of birth is so strong that it erupted from her eyes and caused her entire body to become earthen itself. Her wings and tail even crumbled under their own weight, but that didn't matter. Marble can fly and move around with ease simply by magnetizing herself and whatever she's touching.

To her great disappointment, she soon discovered that there are very few Earth dragons within Clan Dragonblight for her to guide. One was a grumpy old snapper, who had no need of her given the rant Marble received for intruding in her tunnel. The other was an Earth dragon in name only, a spiral in name only even, and while certainly friendly, clearly didn't need her assistance either. While others have joined since then, they rarely needed more than a brief introduction before settling into their own lives.

She has the option to leave, and Rem's made it clear that she'd get a glowing recommendation for the assistance she's offered the clan beyond her ambassadorial duties if she did, but for whatever reason, she doesn't. Marble couldn't explain it herself either.