Matilda Ajan was an officer of the Earth Federation Forces's Medea supply corps. Her unit was often assigned to support the White Base with supplies and repairs. Matilda also served as a personal envoy for General Revil, carrying messages and orders from him. When the White Base was trapped in Zeon-controlled airspace over North America, it was the vital supplies delivered by the Medea supply corps which allowed the beleaguered assault carrier to make desperately needed repairs and escape over the Pacific Ocean.
Due to her habits of showing up when the White Base was in a bind and helping them in whatever way she could, Matilda was looked upon as the guardian angel of the vessel. Due to her stunning beauty, she became the dream girl of many of the young male crew members staffing the White Base, especially the young Amuro Ray. Matilda was engaged to Lieutenant Woody Malden, who was a chief military engineer stationed in the Earth Federation headquarters of Jaburo.
When the ship reached Asia, Matilda gave the White Base orders to head to Ukraine to take part in Operation Odessa, a large-scale military operation to wrest control of the mining facilities at Odessa away from the Principality of Zeon. However, en route to participate in the battle, the White Base was attacked by the Zeon ace pilot trio, the Black Tri-Stars. In order to protect the White Base, Matilda rammed her Medea into one of the Black Tri-Stars' Doms, in an attempt to knock it down. But Dom pilot Ortega hit back, smashing the Medea's cockpit, causing the transporter to crash and explode, killing Matilda instantly. Matilda Ajan was listed as killed in action on November 6, U.C.0079.
Afterwards, Amuro meets Matilda's fiancé Lieutenant Woody in Jaburo, and apologizes for not being able to protect her. Woody forgives him since it was war and because she died doing what she loved the most, protecting her friends in the White Base.
Matilda appears in the novelization of Mobile Suit Gundam in the same capacity as she did in the anime. However, unlike her anime counterpart, it is assumed that Matilda survived the One Year War.