A boy who is fascinated by all manner of strange creatures.

Growing up in the Magnolia Bookshop had quite the significant impact on him. With his guardians being a demon, a man possessed by an angel, and a medium it's no wonder Avenir's interests strayed towards the supernatural. He's good friends with Helios, and the two often work together to track down creatures, although Avenir is more inclined towardss rescue and rehabilitation.

He keeps a detailed journal of all the creatures he has encountered and their habits and abilities he has observed.