A species who were indoctrinated and broken up by the cultish "Thelvin Order" to protect their various religious sites and objects including a precious and ancient Sith gemstone/key.
Krex
Like the Daichyura, the Krex are one of the final sentient species to be introduced within the EU, added to Star Wars: The Old Republic around a year after the current Canon was already underway!
Dybrinthe
The Dybrinthe are Star Wars' answer to "Mortal Engines," a people whose home moon is covered in massive mobile cities who scour the planet's surface for gas to convert into valuable fuels!
Mournish
No, that's not a Nautolan, but instead one of a few "Nautolan-passing" species found throughout the universe (who we know very little about).
Fiumarian
A species with a reputation for being able to use their intellect to divorce their perspective from any sort of opinions, capable of taking truly neutral stances on debates if they so desire, but usually only do so if it can earn them wealth or influence.
Villarandi
A rather standard insectoid species who we've seen very few of, yet they've already made quite a few appearances throughout The High Republic.
Abinyshi
Taking to the stars around the same time as the Duros and Corellian Humans some time in the galaxy's distant past, the Abinyshi were much less influential than their spacefaring peers, remaining relatively secluded until the Empire's rise to power.
Pinurquian
One of only a handful of named sentient species to originate from within the original Marvel Star Wars comic run who, while technically recurring, has seldom appeared in anything since...
Frigosian
One of the most unique named sentient species to come from The Force Awakens, the Frigosians have already proven fascinating and ripe for future exploration!
Kerestian
This species went from mindless predatory creatures to a sophisticated civilization to post-apocalyptic barbarians before ever even being discovered by the outside galaxy.