Chrono Trigger's seven playable characters come from several different eras throughout the game world's history. The game begins in 1000 A.D. with Crono, Marle and Lucca. Crono is a silent protagonist, and characterized as a brave, fearless young man who is skilled in the use of the katana, while Marle is actually Princess Nadia of the Guardia kingdom, an active, spirited tomboy often at odds with her father, the king. Lucca is a mechanical genius and — more comfortable around machinery than people — has few friends other than Crono. She has a passionate interest in science, fueled by an accident that claimed her mother's legs several years earlier, and her home is now filled with laboratory equipment and machinery. From 2300 A.D., Robo is a robot with a bright and curious personality created to assist humans. A worldwide disaster in 1999 A.D. had rendered him dormant, but after he is found and repaired by Lucca, he joins the group out of gratitude.Source:Wikipeadea