The Shinjin (芯人 Shin-jin, lit. "Core people") are a race of beings from Kaishin. The Shinjin are the true race all Kai and Supreme Kai come from before being given their respective role. They usually have a humanoid appearance with hair, pointed ears and distinctive attires. Their planet holds roughly a population of 80 Shinjin at one time. In Dragon Ball Fusions, they are considered part of the Offworlder race.
The Shinjin are born from magical fruits that grow off of the Kaiju. They are genderless, despite them appearing as male and female. The average Shinjin possesses special abilities that far surpass that of any sort of un-trained normal being. Shinjin live leisurely lives, studying various things at a castle-like school. The Shinjin lifespan is roughly 75,000 years, however those born from golden magical fruits can live for several millions of years.
Whenever one of the Kai on the Kai planets passes away, the Shinjin draw lots among themselves to choose who will take the Kai's place and become a new Kai. The Supreme Kais, however, are chosen only from among Shinjin born from a special golden fruit that is particularly rare. However it is possible for a Kai to attain the position of Supreme Kai as shown by Chronoa who became Supreme Kai of Time after she raised Tokitoki into an adult. Additionally, Gowasu was originally training Zamasu to become a Supreme Kai and briefly made him a temporary Supreme Kai so he could use a Time Ring and they could travel 1000 years into the future to observe how the Babarian had progressed as a species.
Most Supreme Kai have the same general appearance: tall and thin humanoid with white mohawks and sharply pointed ears, generally only differing in skin color and other minor details, though there are exceptions, particularly in the case of Universe Seven.
Occasionally, there are Shinjin who are born evil. Those delinquent Shinjin are cast into the Demon Realm ruled by the Makaioshin, where they live with the Makaio and are secluded from civilizations.
- Grand Supreme Kai
- Young Elder Kai/Old Kai/Future Old Kai
- Shin/Future Shin
- Kibito Kai
- North Supreme Kai
- South Supreme Kai
- West Supreme Kai
- Chronoa (Supreme Kai of Time)
- Grand Kai
- North Kai
- East Kai
- West Kai
- South Kai
- Kibito/Future Kibito
- Goku (body swapped with Zamasu; event erased)
- Demigra (Demon Realm God, Shinjin with evil heart)
- Gowasu/Future Gowasu
- Zamasu/Goku Black/Future Zamasu (Former Apprentice Supreme Kai)
- Fused Zamasu (Unofficial Supreme Kai)/Infinite Zamasu
- Litee (attendant Supreme Kai)
- During his appearance at the World Martial Arts Tournament in the Majin Buu story arc, the Supreme Kai uses the name "Shin" at the tournament, which Akira Toriyama later established as the name of the original Kai race.
- Demigra and Mechikabura - two members of the Demon Realm race - are implied to be Shinjin.
- If true presumably they are examples of evil Shinjin.
- In the original manga, Shin and Kibito are the first and only members of their race to have their real names revealed.
- The Shinjin in the series are shown to have either male or female appearances and personalities for example Old Kai behaves like a lecherous old man (similar to Master Roshi) and Chronoa, who has a girlish appearance, is attracted to wild, tough, and handsome older men that are also open-minded and even called Bardock dreamy.
- This shows that while they may biologically be genderless (which makes sense given the way Shinjin are born) they still possess gendered appearances and personalities to match as well as capable feelings such sexual attraction and even lust. They can even show attractions to members of other races (as Chronoa is implied to be attracted to Bardock and Elder Kai often reads Dirty magazines featuring human women).
- Additionally in Xenoverse 2 it is revealed that Elder Kai was hopeful that Chronoa had grown into an attractive girl which Chronoa used to her full advantage to convince him to assist the Time Patrol. However Elder Kai was disappointed that Chronoa had not changed at all in appearance since the last time he saw her. Elder Kai is not attracted to her childlike appearance and even complains how "small" she is and admits he was hoping she'd have been more mature (and voluptuous). Presumably he is unaware of her Tokinokitara Kaihou form which causes Chronoa's appearance to age into a more voluptuous appearance (which would likely be more to Elder Kai's liking). This implies that Shinjin are capable of feeling attracted to other Shinjin (at least those with opposite gendered appearance).
- However because Chronoa has a girlish base form, Elder Kai does not act lecherous towards her and thus she does not have to put up with his lecherous behavior as some of the female Time Patrollers are forced to deal with.
- It is unknown if Shinjin engage in any form of romance themselves though Chronoa is quite the romantic as she worries about Android 18 and Krillin's relationship never occurring as a result of Cell absorbing both 17 & 18 in the Android Warfare Saga (apparently recognizing that Krillin only destroyed the Shut Down Remote and protected 18 after Cell had absorbed 17 and realized that had those events never occurred it could prevent 18 and Krillin's marriage from occurring). Chronoa even admonishes Trunks: Xeno for being so dense when it comes to romantic matters.