Els is shown to be an alpaca based on her student ID card. However, she is in fact an Angora mountain goat.
Paru Itagaki drew Legosi when she was in junior high school, but the concept and character evolved over the years into the "Beastars" tale.
Paru Itagaki named Legosi after actor Bela Lugosi, and based his appearance on actors Mathieu Amalric and Ken'ichi Matsuyama.
Paru Itagaki considers Louis the most difficult character to design, due to his ironic characterization as a herbivore in a carnivorous world.
According to Paru, minor reoccurring character Dom is gay. This adaptation made it a little more obvious by having Dom speak very effeminately.