The Campis are surprisingly one of the only 3-armed humanoids within the entire franchise, save for maybe Star Wars Legends' Oblee. As of the initial publishing of this article, we've just now been introduced to them, though I doubt we've seen the last.
Brayan
This humanoid species hails from a world known by some as "The Planet of Eternal Night," leading to their rather extreme features, though they remain the least unsettling thing on a planet also inhabited by literal space vampires.
Rendellian
An avian-ish humanoid species whose canonicity is technically dubious given the nature of their one and only appearance within "Tales from the Death Star."
Tolgroat
One of the only named species to originate from "Star Wars: Visions" so far, identified thanks to a blurry, blink-and-you'll-miss-it shot of concept art from the "I Am Your Mother" Filmmaker Focus on Disney+!
Shorwilt
One of my favorite species to originate from the "The Acolyte" live action television series, the Shorwilts hide a rather interesting anatomical feature that could give them the upper hand in dire situations.
Vuvrian
Somehow one of the most visually striking species from "Episode IV: A New Hope" also remains one of the most obscure, being long overdue for the spotlight that many of their contemporaries have already received!
Constancian
I know "uncanny valley" has become a bit of an overused buzz phrase, but if any sentient species in Star Wars embodied this idea, I think it would have to be the Constancians, who would probably be unsettling across any medium.
Borneck
Honestly, one of the most peaceful and content species I've ever written about, who don't come across as all that compelling, but sometime it is nice to have a break from writing about the tragedies so commonplace within the Star Wars universe!
Jaluku
One of my favorite alien designs to come from "The Rise of Skywalker," I still remember the day I found out that the name "Jaluku" had been randomly dropped in the "Batuu Bounty Hunters" Galaxy's Edge companion app!
Pada
There really isn't much to say about the Pada as it stands, bipedal felinoids with goat horns is about as "throwaway" as it gets, though, as always, I hope they will be fleshed out more someday in the future!