Dimentus used to be the noble son of an Augian senator before he was sold as a slave to the red seraf Yaroi. In order to infiltrate the nobles of the Empire of Auga, Yaroi fed from Dimentus to look like a caesarion. This caused Dimentus body to change, and he knows he can never go back to his old life.

Here we see more of how the serafs look like. They are pretty human looking, but with large wings instead of arms.