Aria Tensus is a Centauri female from a minor noble family. In 2258, her family arranged for her to marry a Centauri noble old enough to be her grandfather. She had fallen in love and wished to marry a man her own age, Kiron Maray, the cousin of Vir Cotto.
Kiron himself was also engaged to a very "ugly, old woman." They fled Centauri Prime, on the Carbo, a liner heading to Babylon 5 (since Vir had told Kiron he was actually the official ambassador on the station). They were taken into custody immediately upon arrival, as they had used stolen credit chips to make the trip. Commander Sinclair turned both of them over to Londo Mollari, who criticized them for their "radical" desire to be married for love instead of duty.
While on the station, both of them were attacked by members of the Homeguard, a radical anti-alien group. Aria suffered minor injuries, but Kiron was seriously wounded, left in a coma. Aria insisted on staying at his side in medlab. Kiron managed to recover, awakening only a day later.
Londo and Vir met Aria and Kiron in Medlab, where Londo explained that as soon as Kiron was well enough to travel, they would return to Centauri Prime. However, they would not be returning to their families, but rather they would be met by Londo's second cousin, Andilo Mollari, who will take them into a period of fosterage in his family. Londo explains that their families will certainly not refuse such an honor. They will live with him for a few years, and he will eventually give them permission to marry whom they choose--even if they still choose one another. Aria and Kiron are overjoyed at the news.
Aria and Kiron's sole appearance is in "The War Prayer."