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.
Lara Jill Miller who is typically known for playing several kid-friendly human and rabbit characters, voices Haru, who has less compunctions about beating around the bush when it comes to sex.