Dwarnian

Dwarnians are only known non-Human sapient alien species in the galaxy.

Dwarnian characters on The Strange Case of Starship Iris include Krejjh, Eejjhgreb, and Thasia.

Dwarnian Biology
Dwarnians are purple.

They are "humanoid enough that Krejjh can comfortably pilot a ship designed for humans, and humanoid enough that it’s not weird that Krejjh and Brian are together."

Dwarnian Culture
Dwarnians do not have any cultural concept of gender.

Dwarnian relationships are structured around clans. Members of the same clan have shared particles in their names that mark them as relatives. Dwarnian weddings are big and important events that the entire family is expected to share.

In school, most Dwarnians study the Vree Chel Noke language. Dwarnian epic poetry and battle poetry are important classic art forms. More modern art forms also include historical-drama TV shows.

Dwarnian technology is far superior to that of humans'.

Dwarnian Language
Dwarnians speak a language that is usually referred to as "Dwarnian." Brian mentions a dialect called "standard Exo-Dwarnian," suggesting that there are dialectical divisions between the Dwarnian language spoken on the homeworld and among spacefaring or colony populations. There are references to phonemes such as a "Dwarnian J" which implies that they have a somewhat different phonetic system to Earth languages.

Krejjh speaks Dwarnian natively, while Brian Jeeter has learned Dwarnian and at one point worked as a translator on Neuzo.