EVERYTHING ABOUT POTARA EARRINGS

Potara are earrings that are worn by Supreme Kais and there apprentices. Despite being worn so casually, they have incredible properties, allowing two individuals to fuse or permitting the wearer to use the Time Rings (As Goku black needed it). The Potara Earrings were originally nothing but decoration, however, when Akira Toriyama wanted to introduce a fusion for Goku and Vegeta without taking away from Toei's upcoming movie at the time, he decided to introduce the concept that the Potaras were fusion items into the story.

These earrings are worn by all Supreme Kais as part of their standard outfits, coming in various colors. The earrings can grant the wearer certain privileges, such as using the Time Rings that are exclusive to Supreme Kais. The earrings also have the ability to fuse two people into a single entity for an hour, although it is permanent if a Supreme Kai is involved. Only Supreme Kai are supposed to possess Potara earrings, which are signified by their distinct green color (though the anime, colored manga and games incorrectly depict them with a variety of colors).

Old Kai gives his pair to Goku as a trump card for defeating Super Buu. Shin (supreme kai) and his attendant Kibito accidentally merge without knowing about the fusion being permanent.

In Dragon Ball Super, Goku Black wears a green Potara earring in order to use the Time Ring in his position. The Potara Fusion is mentioned again by Gowasu and Zamasu, as Gowasu appoints him briefly to the rank of Supreme Kai by giving one of his Potara so that Zamasu could use the Time Ring. Gowasu suggests that they could fuse permanently if they wish so, but Zamasu rejects the offer. It is also revealed that if two Potara earrings are worn on the same ear, the two beings will not fuse.

Later, Future Zamasu and Goku Black fuse into Fused Zamasu using the Potara as their final trump card. Goku offers to fuse with Vegeta again, but Vegeta is initially hesitant. Gowasu then reveals that the reason why Goku and Vegeta did not stay fused the previous time is that neither of them are Supreme Kais and that fusion without a Supreme Kai would only last an hour. Vegito is born once again, but defuses before even forty minutes has passed. Gowasu speculates that Vegito Blue is simply too powerful for the fusion to sustain. In the manga Fused Zamasu also defuses.

In the anime, before the start of the Tournament of Power, Champa and Fuwa give the Universe 6 Saiyans a pair of Potara earrings as a last resort to use. Caulifla and Kale put them on in the tournament after getting overwhelmed by Goku. They fuse and become Kefla, who then proceeds to combat Goku. Kefla pushes Goku to the state of Ultra Instinct and is defeated as a result. Rabanra and Zarbuto of Team Universe 2 attempted to perform Potara fusion as well but failed when Kefla ran over them and destroyed their earrings.

If a living and a dead person fuse, the result will be living. If a fused being dies, he or she will remain fused. If the earrings are removed or destroyed, nothing will happen if the fusion is permanent,but the fused being will defuse if it is temporary. If a fused being defuses, both individuals will retain the memories of the fusion, as well as some memories from the other individual.

In the anime, according to Vados, the fusion creates a new body and personality greater than the sum of the two individuals and increases their power by tens of times. When Goku Black and Future Zamasu fused, Gowasu stated that their power did not just merge, but expanded to no end. Even without transforming, Kale and Caulifla's fusion, Kefla, was capable of completely outclassing the tired Super Saiyan God Goku, who stated that her energy is so massive that he could not even feel a limit.

Unlike the Fusion Dance technique, the Potara Fusion does not require the individuals to have equal power levels; the fusion lasts an hour instead of thirty minutes (unless one of the fused is a Supreme Kai, in which case the fusion is permanent); and it also fuses clothing, whereas the Fusion Dance gives the newly fused being the native dress of the people of Planet Metamor.

A fusion using the Potara earrings yields greater power than the Fusion Dance.

In some cases, such as Old Kai and Kibito Kai, one of the two fused individuals takes over the fusion's voice. In other cases, such as Vegito or Kefla, the two individuals' voices are overlaid, similar to the Fusion Dance. Fused Zamasu has two Zamasu voices on top of each other, despite one of the Zamases, Goku Black, having Goku's body and voice at the time of the fusion.

If fusion occurs without a Supreme Kai, the fusion only lasts an hour; this is further reduced if the fused being is so powerful that the power sustaining the fusion gets used up. In the manga, Fused Zamasu overcame this weakness by being the fusion of two of the same person.

If an individual is transformed while fusing, the fused being will not be able to power down from that transformation. As a result, certain transformations, such as Super Saiyan, can put a significant strain on the user's body and shorten his or her lifespan. Fused Zamasu is permanently in the state of Super Saiyan Rosé due to Goku Black using it when he fused.

In the anime, if an immortal and a mortal were to fuse, the regeneration of the fused being from the immortality will be impaired. If the damage is sufficient enough, the body will not heal properly and will become corrupted; it is even possible for the body to be completely destroyed, as shown when Fused Zamasu destroyed his own body after Future Trunks cut it in half with his Final Hope Slash. Despite this, Fused Zamasu did not actually die and continued to exist without a body. In the manga, this does not exist.

A user of Forced Spirit Fission technique can defuse a Potara fused being by splitting and tearing apart it's fusees individual spirits into their separate original selves.