Ranka behaves a lot like a dog/wolf, like protecting territory, food or chasing bones. When she is happy, she would wave her tail like a dog and can be easily won with food. She loves to act like the boss of a pack, but in reality, she does not have one and is desperate and willing to do anything in order to become friends with someone. Although she is a bit stupid, she is really kind and understands how awful it is to be alone, she was really happy that Jin agreed to form a pack with another human, Hitomi.

When she was young, she was saved by a boy from three bears. However, In reality the boy was beaten by them, but Ranka remembered it differently and since that was the first time someone from a different species protected her, she was happy, and ever since then dreamed of forming a friendship and pack with different animals.