Karuha
Karuha is a ghost who was once a human girl. She was killed by a group of bandits who were trying to steal her family's treasure. Her spirit was then bound to the treasure chest, and she became a magical familiar to the next person who opened it.
Karuha is a very playful and mischievous spirit. She loves to shapeshift into different animals and play tricks on people. She is also very loyal to her master, and would do anything to protect them.
One day, Karuha's master, Yato, was attacked by a group of demons. Karuha used her shapeshifting abilities to protect Yato, but she was eventually overpowered. Just when it seemed like all hope was lost, Yato's other familiar, Yukine, arrived and saved the day.
Karuha was grateful to Yukine for saving her master, and she vowed to protect him as well. She now travels with Yato and Yukine on their adventures, and she always has their backs.
Karuha is a powerful and loyal spirit, and she is a valuable asset to Yato and Yukine. She is a force to be reckoned with, and she will never back down from a fight.