The Kishin Egg replaced the Shinigami's List concept and is exclusive to the anime of Soul Eater and its affiliated video games, Soul Eater: Monotone Princess, Soul Eater: Battle Resonance, and Soul Eater: Medusa's Conspiracy.
Individuals who become Kishin eggs enter the first stage of becoming a Kishin. Due to their crimes, their souls becomes corrupt. The soul appears to be a dark hue red, the tail appearing to be a much more light and brighter red color. The middle of the soul is purple and surrounded by hexagonal plates. However, undergoing through the process makes one lose their sanity and even humanity.
Although it's been stated by Death it that only demon weapons can consume souls such as Kishin eggs,, it appears that any individual are capable of eating souls and transform into a Kishin Eggs such as Al Capone and his gang.
Demon Weapons wishing to become a Death Scythe must eat 99 Kishin eggs along with one witch soul in order to become one. However, Kishin souls that are not consumed are seen buried into the Death Room.
- In the Soul Eater NOT! anime, Shaula's soul is seen to look much like that of a Kishin egg. It should be noted, however, that the Soul Eater NOT! anime follows its source detail much closer with details change and a deviation towards the end, therefore, the concept does not exist. The animes are not consistent with each other.
- One of the various inconsistencies in Soul Eater anime is that though the Kishin eggs individuals are normally human, Asura's soul is seen as a Kishin Soul within the end credits being buried, despite him being a Shinigami. Mosquito's soul is also shown to be a Kishin egg, despite the latter being identified a Bloodsucker.