Aramis commands as a high-ranking Machine Empire officer, overseeing B't manufacturing and spearheading development of the ultimate B't, Raphael. She manages critical projects aimed at countering Raphael's uncontrollable evolution, a mission that leads to Kotaro Takamiya's abduction for his expertise.

Portrayed initially with fierce loyalty to the Machine Emperor, her involvement in Karen's escape triggers her demotion. Her past surfaces as the legendary "Rose Knight," a warrior serving the Empire before the Spiritual Guardians' formation. This history starkly contrasts her later disillusionment.

She demonstrates significant combat prowess, wielding a sword effectively. A notable childhood duel with Ron, another high-ranking Empire figure, resulted in his permanent lightning bolt-shaped scar. Aramis presents with an androgynous style, potentially drawing inspiration from her musketeer namesake.

Within the *B't X Neo* OVA, Aramis's storyline diverges significantly from the manga. Following the revelation of her Rose Knight past, she departs the main narrative, reappearing only briefly in Episode 13. She does not participate in the final confrontation against the Machine Emperor or Raphael's evolved form. Her partnered B't is named Rosemary, though its specific capabilities remain undetailed.