Another concept sketch. I don't like the pose, but wanted to get general proportions, frills, features right.

Rie Ree stand roughly 4 to 4.5 feet tall on average. Skin and fur are a combination of organic plastic polymers, which provides a modicum of armor against blunt trauma, while being very light and thin, but require periodic skin shedding similar to terrestrial reptiles. Their fiber-optic-like fur is shed wholly during this process, leaving them utterly smooth until it grows back.

Rie Ree have two genders, though externally there's very little sexual dimorphism except when females are pregnant. Young are hatched from clutches of one to three spherical eggs, laid by the female after a gestation period of about six months, and must be kept warm, usually in shelters, ice-stone nests, or blankets woven from shed manes and tailfur.

Rhree, the Rie Ree homeworld, averages around -100° C in the equatorial to about 60° north and south of the equator, though cryovolcanic hotspots can get up past the melting point of H2O. Nearer the poles, icebergs and glaciers of mostly ethane roll down to the hydrocarbon (again ethane) seas. Life evolved in a slightly warmer period in hydrocarbon seas, and migrated to land once a complicated equilibrium was developed between methane, hydrogen, ethane, and acetylene respiration systems. When the planet cooled to its current state, seas receded and froze and precipitation faltered, creating huge deserts covering the majority of the frozen world. The Rie Ree arose from tundra hunter-chaser stock before the planet reached its current 'desert' state, with civilizations rising and falling all around the shores of a single large hydrocarbon sea. Progress of technology has never been easy here, and is mostly based around 'wood', bone, and ice (stone) tools, though some harder materials (such as flint) are rare but commonly known about treasures. Oxygen is in quantities such that fire could exist here, though very weak and difficult to control as well as keep lit, though the concept of fire is one of the ancient secrets of the Rie-Ree past.

Civilization is clustered around a few relatively 'wet' areas rich with the methane producing 'plant' life, where acetylene is abundant in the soil fixed by native bacteria, and united under a technical/priestly order known as Urrhanathal (The term serves as both geography, class of nobility, the religion itself, its codex of customs and rituals, and the dating system used within the priesthood's control).

Pockets of life-sustainable methane/acetylene rich zones with ethane oasis dot the planet, and its here that nomads and barbarians set up camp, hunt and forage from, and strike raids against Urrhanathal, stealing food, tools, livestock, and occasionally eggs, if their own numbers are diminished. These clannish people speak a language similar to those of Urrhanathal, suggesting that they share a relatively recent common ancestry, though the history of these people is one that would take some work to unravel past a century or two.