Atlas has an exceptionally aggressive disposition and values power above everything else. Having previously fought as a soldier in a country that has been ravaged by Mavericks, she developed the belief that human beings can only evolve during times of war and spurns peace, wherein survival of the fittest as the only justification; thus she plays the Game of Destiny in order to plunge the world into a never-ending state of war in order to spur on human evolution. It is therefore curious that she would cooperate with her Mega Man opponents such as Thetis, who wishes for the complete extermination of the human race.

Her aggressive personality is similar to that of Model F's persona, Fighting Fefnir; however, whereas Fefnir merely lived for the thrill of battle, Atlas is motivated by her hatred of weakness. Similar to Fefnir, however, she was capable of being impressed by her opponent's skills if either beaten or hit with a severe attack, as evidenced by the Japanese version where she yells "impressive!"