Space Rey. He lives in a large flooded geode, separated from the rest of the world. He is allergic to seafood, however, so he eats gemstones and rocks that he finds. He got crushed by a big rock, earning him a crack. He has a hard time outside of the water due to the crack, as the water inside of him leaks out. Logically, he would be able to survive in lava as well, but nobody has ever seen this before and he's too scared to attempt this.
Apologies for being late