Aster is the only male Sonatina since Kattis’ predecessor Yadav passed away. He is largely polite, careful, and methodical in his actions. When he’s not up to the nose in work, he’s often relaxing or checking up on everyone he feels could use some comforting words.
Aster's character design and personality were created by Tomoyo Ichijouji, a frequent writer, staff, and cast member in PTverse works. She also created the character design for his troops.