Marble

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Overview
Marble is a Shadow who dwells in The Depths, and is from a universe divergent from Zone Fusion in which Shadow was fused with the Marble Zone. He is described to have a body 'made from purple stone', with ruby accents and a small patch of grass on his chest, similar to chest fur. His eyeballs and quill streaks are seemingly made of glass, or otherwise completely transparent, showing that his head is completely filled with lava.

Lava Manipulation/Absorbtion
Marble, though it wasn't shown, has the ability to fire high-pressure streams of lava from his mouth and can come into contact with lava without any damage.

Stone Physiology
Marble's body is made of stone, making him very durable and giving him high striking power, at the cost of large weight.

Thorn
Marble met Thorn when she entered his room, right after he and all the other fusions in the room had been quite heavily injured after someone had gone through the room and challenged them all to a fight. Thorn appreciates Thorn for promising to defeat the one who defeated them all, and would like to meet her again under nicer circumstances.

Trivia

 * Originally his role was to be filled by a divergent Zone Fusion Rouge, fused with Starlight Zone, but SinFrog goofed and made the room Starlight Zone, so he had to come up with a new fusion on the spot.