Xanderth, red dragon, isn't quite social.

Gem found Xanderth when he was just a little draggy and took care of him. When Xanderth grew older, he always romped off for long periods of time but always came back.

Even though Xanderth isn't seen much since after Gem's death, Xanderth still dwells in his lair near a boiling underground volcano that has yet to burst.