A fox girl or fox boy with multiple tails. In Japanese mythology, a kitsune is a mystical shapeshifter whose normal form is that of a fox. Every 100 years, a kitsune will gain a new tail, up to nine at 800 years. These tails symbolize the amount of knowledge and magical power the kitsune has gained over its long life. A kitsune with all nine tails is a kyuubi.