taken fron Wikipedia
Chrono Trigger's seven playable characters come from different eras in the game world's history. Trigger begins in 1000 A.D. with Crono, Marle, and Lucca. Crono is a silent protagonist, characterized as a brave, fearless young man skilled with a katana. Marle is Princess Nadia of the Guardia kingdom—an active, spirited tomboy with a crossbow. Often at odds with her father, Marle hides her royal lineage to slip out of the castle. Lucca is a friend of Crono and a mechanical genius who wields a gun; her home is filled with laboratory equipment and machinery. From the era of 2300 A.D. comes Robo, a robot with a bright and curious personality created to assist humans and outfitted with a powerful arm. Found dormant in the future, Robo is repaired by Lucca and joins the group in gratitude.
The fiercely confident Ayla dwells in 65,000,000 B.C. Unmatched in raw strength, Ayla is the chief of Ioka Village, and leads her people in war against a species of humanoid reptiles known as Reptites. The last two characters—Frog, and the optional character Magus—originate in 600 A.D. Frog is a former squire once named Glenn; Magus the warlock turned Glenn into an anthropomorphic frog and slew his friend Cyrus. Chivalrous but mired in regret, Frog dedicates his life to protecting Leene, the queen of Guardia, and avenging Cyrus by killing Magus. Magus is a powerful sorcerer and the leader of the Mystics, a race of demons and intelligent animals who war against humanity. Magus was once known as Janus, the young prince of the Kingdom of Zeal, which was destroyed by Lavos in 12,000 B.C. The incident sent him forward through time, and as he ages, he plots revenge against Lavos and broods over the fate of his sister, Schala. Lavos, which destroys human civilization and ravages the world in 1999 A.D., is an extraterrestrial parasitic creature that harvests DNA and the earth's energy for its own evolution.
