Brinarr

The Brinarr (pronounced BRINE-ar) are entities made up of multiple Einarr souls inhabiting a coral-laced armor body. The first successful Brinarr was Tessellation, followed shortly thereafter by Ampersand Five. Brinarr need regular submersion in water to remain functional; else their coral dries out and their constituent spirits can no longer interact with their bodies. Modern Brinearr armor can usually store Ethersea water in circulation for some time, but showers or submersions are still neccesary to replenish those stores.

It has been established that Brinearr possess many human-like physiological responses. Rather than sweat, Brinearr exude a slime (Ethersea - Episode 3), and are still capable of smelling scents, despite not strictly speaking having a nose (Ethersea - Episode 4). When traveling through water, Brinearr are able to propel themselves by jettisoning air and water through the hollows of their body, similar to how real-world corals and sponges can produce oxygen and pump water. When injured, Brinearr bleach rather than bleed, slowly growing paler and paler as their coral goes into shock.