Telepathy

Telepathy allows users to transmit thoughts directly into another person's mind, enabling communication across any distance. It also permits mind reading, letting the user access the target's memories and thoughts. The technique is not hindered by dimensional barriers; Piccolo communicates telepathically with Goten and Trunks while they are inside the Hyperbolic Time Chamber despite being outside it himself.

The technique has some amusing limitations. When Korin tries to read Maron's mind during a poker game, he fails entirely, remarking that he has "seen party balloons with more on their mind." Lord Slug's use of telepathy on Bulma leaves her dazed and confused as he rifles through her memories.

King Kai is arguably the most important telepathic user in the series. His ability to link minds across the living world and Other World serves as the primary communication infrastructure during major crises. During the Saiyan Saga, he relays critical information about Vegeta and Nappa to the Z Fighters. On Namek, he connects Goku, Piccolo, and the others despite being on his own small planet. During the Buu Saga, telepathy is essential for coordinating the Super Spirit Bomb, with Goku and Vegeta calling out to the entire population of Earth to donate their energy.

Babidi's Broadcast

Babidi demonstrates a particularly sinister application of telepathy during the Buu Saga, broadcasting his voice directly into the minds of everyone on Earth to demand information about Goten, Trunks, and Piccolo. His telepathic reach is planetary, and his messages are accompanied by horrifying images of Buu's destruction. This is telepathy weaponized as psychological warfare.

Without telepathy, many of Dragon Ball's most important storylines would not work. Characters are frequently separated by planets, dimensions, or the boundary between life and death, and telepathy is the only reliable way to keep them coordinated. It is the least flashy technique in the franchise but arguably one of the most narratively essential. Every time Goku receives a crucial warning, every time a plan is hatched across dimensional boundaries, and every time the Z Fighters organize a last-ditch effort, telepathy is the invisible thread holding it all together.