Guru are characters that appear in Chrono Trigger They lived during the Antiquity, served as wise men and advisers to Queen Zeal, and were among the few Enlightened Ones who did not look down on the Earthbound Ones.
When the Mammon Machine was activated, the three Gurus were sent to different three-time eras, presumably by Lavos. Belthasar was sent into the Future, while Gaspar was sent into the End of Time, and then Melchior was sent to the Present. All three of them a large role in aiding Crono, Marle, Lucca, Robo, Frog, Ayla, and Magus in stopping Lavos from destroying the world.
See Also: Melchior
The first Guru, the Guru of Life, encountered is Melchior. He makes a brief short cameo appearance in Leene Square as a weapons merchant. Melchior asks Crono to convince Marle to sell her pendant to him. If Crono agrees it will be used as evidence against him in the trial for Marle's alleged kidnap. here he sells weapons, the Crimson Blade, being one. Returning to the Middle Ages, the party assists Guardia against Ozzie and his fleet of undead minions at Zenan Bridge, subsequently learning that Magus is behind the assault. They discover that Frog is in the area and that he needs the Masamune to be repaired if they are to stand a chance against the Shadow-magic wielding Fiendlord. while Taking the Broken Blade and Broken Hilt to Melchior's Cabin, they learn that the Dreamstone needs to repair it. Acquiring a sample in Prehistory era from a chieftain, Ayla, meanwhile, Melchior repairs the sword with ad help from mechanics-genius, Lucca.
See Also: Belthasar
The second Guru, the Guru of Reason, encountered is Belthasar. He can be spoken to briefly in Keeper's Dome when the party travels to 2300 AD to escape the Chancellor. There, he is accompanied by a Nu. He boasts of having created the Epoch, Ocean Palace, and other prominent Zeal technologies. After Schala seals the Gate to Zeal, the player returns to Keeper's Dome, searching for the Wings of Time. Belthasar is no longer present here; it is implied from his Nu and from the Shines past the Sealed Door that he has perished in this Timeline. He uploaded his mind into his Robotic Nu creation, and that creation puts the seats into the Epoch and gives a brief tutorial on how to pilot time with it.
See Also: Gaspar
The third and last Guru, the Guru of Time, encountered is Gaspar. He is met at the End of Time, where he takes vigil against a lamp post and greets new time-travelers. Periodically, he offers would give advice to Crono and his friends. At the end of the game, he provides them with the Time Egg.
The three Gurus get their English names from the traditional names given to the Magi who brought gifts of gold, frankincense and myrrh to the infant Jesus in the Christian tradition.