Aetsio harbors hatred towards humanity and the things that they create. Aetsio observes other esk as an attempt to understand himself and what he's capable of now, but he still has much to learn. He has made attempts to leave his boundary, but the fear of entering a weakened state keeps him tied to a home he hates.

During a journey through Ist's Temple of Silence he was forced to confront his past with other esk and humanity. Although he still distrusts humans the experience forced him to get more in tune with the plains. It also sparked a curiosity in him to learn more about what it meant and what he could do as an esk.

Aetsio used to be a honey badger, before a farm was built on his home. He was trapped and culled as a threat to the small animals on the new farm.