Lethan Twi'leks were a type of Twi'lek distinguished by their red skin pigmentation. Despite the rarity of this trait, reportedly affecting only one in a million Twi'leks, a notable number of female Lethan Twi'leks resided on the planet Naos III.
Individuals such as Taunt, Shakka, Alora, Kelad'den, Fa'ale Leh, Zhar Lestin, Yadira Ban, B'ink Utrila, Darth Atroxa, and Darth Talon exemplify Lethan Twi'leks. Furthermore, Senator Orn Free Taa had a Lethan Twi'lek as both his consort and aide. B'ink Utrila, Yadira Ban, and Zhar Lestin are examples of Lethan Jedi, while Darth Talon and Darth Atroxa represent Lethan Sith.