Tricia Cotton Corvina, also known as 4th or Tricia, is the main heroine of the 4th's Harmony story within the Xanatos;Deception story arc. She is considered one of the more powerful beings within the Deception Worlds, almost rivalring those of the Nine Saints. This is because of her Corvina Clan bloodline and also because she is not a Sleepless or Persona.
In the "real world," Tricia is a forgotten member of the Corvina Clan and has been infected with HIV since birth due to a blood tainted blood-transfusion. Her real parents and siblings have already succumbed to the disease by the time of 4th's Harmony and she has no known relatives. In her younger years, she attended schooling like a normal girl, but was subject to constant transfers and moves once her condition was found out.
One year prior to John Rolfe's awakening in the Sleeping Scrawl, she was officially diagnosed with AIDS and was admitted into a hospital cleanroom. It was from then on that she was able to access to the Deception Worlds in her sleep and there became friends with each of the Personas.
She became good friends in particular with Aria Karenn Gaumont in the "fake" worlds and the real world. Realizing her life was soon at an end, she had Aria assist her in removing the seals from the Personas, making them into "real" humans. Soon after, she quietly died in the arms of Aria. Unbeknownst to her, she was the final key and her death was one of the direct causes leading up to the release of Liselotte Rhiannon Corvina.