Sax Hastur was a Nashtah Squadron commanding officer and a human.
Jason Fry penned the canon short story "Last Call at the Zero Angle," which featured Sax Hastur. It was released in Star Wars Insider 156 on March 10, 2015.
A picture of Nashtah Squadron's pilots, created by John Van Fleet, was included with the short story, but the identity of each pilot was not specified. Jason Fry subsequently verified the pilots' identities in the illustration via Twitter.