A scientific genius who is proud of his Garlean heritage and strives to remedy his people's inability to wield of magicks. Despite claiming that Garleans are intellectually and physiology superior to other species, whom he calls "lesser species", he acknowledges that his people lack the means to wield magick at the same level as those from Eorzea.However, his proposal in altering the genome of the Garleans so they might be able to wield magicks was met with skepticism and suspicion. Thus, was Aulus supremely annoyed with such views, likely making Aulus prideful of his work. Fortune came for his when Zenos approached and offered him the funding to continue his work. As a result, Aulus is very grateful and loyal to Zenos.
Prior to the events of Stormblood, Aulus was a scientist whose theories of enabling Garlean to use magick was mocked by all save Zenos yae Galvus who funded his research.
Aulus is fought as the second boss of final dungeon from Stormblood.