Tio was initially wrathful, a true vilian, wanting to kill Elenyah because she wasn't good for his Original Self, Tera. But with time he was humbled down and became more sympathic as he became his own self. Aisuru helped him becoming better, and Elen soften him.
Short Story
Tio was originally part of Tera, as his forst inner-wrath demon. And later he founded the ODM. After coming into Akasen, he supported his wife weight gain and her daughter behavior, before getting sent out of the universe by higher beings. Now he's back, and took back his job in the labs.