Guest can learn one of the nine breathing styles to become a Hashira, or even create their own unique breathing style

The types of breathing are: Water Breathing Flame Breathing Wind Breathing Stone Breathing Sound Breathing Mist Breathing Serpent Breathing Love Breathing Insect Breathing

Alternatively, you can become a Demon who hunts them. Demons grow stronger by eating humans or through training. Twelve of the demons possess their own unique Blood Demon Arts