The Milvaynians were the people who resided on the planet Milvayne, situated within the Inner Rim Territories. Their population consisted of humans, such as Tam Posla, alongside several different alien species like Abednedos, Ishi Tib, and also Rodians.
Tam Posla's appearance in Rogue One Adaptation 2 marked the initial introduction of a Milvaynian. Subsequently, the "Helmets" portion of the sixty-fifth issue of Star Wars Helmet Collection by De Agostini, released in 2018, identified "Milvaynian" as Posla's species. However, the 2019 reference book Ultimate Star Wars, New Edition presented a conflicting view, stating that he was human. Later, the "Din Djarin and Other Characters of the Underworld" issue from Star Wars Encyclopedia by De Agostini affirmed Posla's human identity and used "Milvaynian" as a demonym, solidifying its meaning. Consequently, this article disregards the details presented in Star Wars Helmet Collection.