Aria was the former leader of the Giglio Nero Famiglia. She is known as the mother of Uni and the daughter of Luce. In the Future Arc, it is mentioned that she passed away due to an illness, likely caused by the Non-Tri-Ni-Sette or Negative Seven Rays, as she bore the curse. Flashbacks involving Gamma suggest a close bond between them, hinting at a romantic relationship beyond their roles as boss and subordinate.
Aria administered the Sky trial. During this trial, Tsuna had to follow her instructions without question, even to the extent of protecting her from men wielding box weapons, despite not knowing if she was an ally or enemy. Ultimately, Tsuna earned the Sky seal after successfully completing the Trial of Tolerance.
