The core theory behind Gikon is to inject foreign Reiatsu into one's body, and for the individual to turn that power into their own. Artificial souls are used by ingesting a Gikongan. The pill forces the soul out of the body and allows the artificial soul to take control of it, operating in a pre-programmed manner until removed by the Shinigami. They can be used on a body which has no soul, such as a corpse, or even an inanimate object, such as a stuffed animal. These artificial souls possess their own personalities, which can be specially designed to fit one's specifications.