Younger Than He Looks: When he and Aya first met, she was only 7, going on 8, while Tooya was only a year old. By the time they found out about their Forgotten First Meeting, nine years have passed, meaning that Tooya is only around 9 or 10 years old.
Nice Guy: Certainly started out like this, being an upstanding member of his tribe who was always willing to help others, and was implicated to being the only man who wanted to truly love Ceres for who she was rather than for her body.
Pet the Dog: He truly loves his mentally-unstable mother. In fact, it's implied that his obsession with the Celestial Maidens come from his few good childhood memories, centered on how his then-sane mom explained the hagoromo legends to him.
Raised as the Opposite Gender: She identifies as a female now, but was raised as a male because she's one of the Maidens and her parents were terrified of the idea that she'd take her hagoromo and run away from them.