Finnra

Finnra is the main antagonist of the series. Her true form is cobra. She adopted Ritsu and convinced him to be a Shadow Realmean. She forced him to change his name and pretend that his true form was cougar instead of his real true form, wolf. Finnra is the leader of the Shadow Realm and often captures Casonians and puts them in prison-like camps. Once they aren't needed anymore, she sends guards to shoot them with an arrow.

Finnra figured out how to 'lock' someones kindar to leave them stuck in the form they were in when they got locked.