Gikon

are souls, designed by Shinigami scientists, which separate a Shinigami's spirit from a Gigai, should they be inhabiting one, or evict stubborn spirits from their corpses if necessary. The processes involved in the creation and ingestion of these souls were invented by Kirio Hikifune.

Overview
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. 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.

History
Gikon and the means to insert it into a body were invented by Kirio Hikifune. Before she came along, the thought of making artificial souls was a foreign one. She, building upon the idea of Gikon, created the artificial pill, Gikongan.

According to its inventor, Kirio Hikifune, the core theory behind the artificial soul is to take the reiatsu from one source and inject it into a different body, with the intention of turning the introduced power into that body's own.

Soul Candy
Gikongan is commonly called because the Shinigami Women's Association, complaining its name was not cute, had it changed. To fit with the more informal name, Soul Candy is contained in toy dispensers, which have the heads of cartoon characters on them. These dispensers come in many varieties, with some being more popular than others. Artificial souls tend to have personalities which reflect traits of their corresponding dispenser's character.