Inga's past was revealed in the Un-Go movie titled 'Un-Go Inga-ron'. The movie explains how Inga got his/her female body and how Shinji and Inga met. During the movie it shows that Inga was trapped/sealed( some sort of ritual grounds) and was awakened when Shinji came flying to the statue and punctured his neck, it is to be believed that it is blood that activated the statue seeing as how Bettenou was awaked by Serada's blood being placed on her statue. At this moment Inga possess' Shinji and is forced to eat the souls of all, except one, his friends. Inga inhabits the body of a woman named Yuuko from Shinjuro's past who gave up her life to make sure no one could see into her soul and at the same time saved Shinji.During this time Shinji promised Inga that he knew a place filled with liars and he would take Inga in return that he/she could not kill the people he/she ate. The female form you see through the series is actually Yuuko's body and is shown that Shinji does not like Inga using that form.So, Inga transforms into a boy based on the picture of a boy he sees in the film strip which Yuuko had in her pocket at the time of her death which she took from Shinji.
According to Shinjuuro, she can ask a person any single question, and the person 'will have no choice but to answer with the truth'. She does this instead of killing her victims, as a result of a deal she made with Shinjuurou in exchange for souls. Inga inhabits the body of Yuuko, a woman from Shinjuurou's past who killed herself to make sure no one could see into her soul, saving him in the process.
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