Frédéric Chopin is one of the central figures of Eternal Sonata. He appears both in the real world, where he is on his death bed, terminally ill with tuberculosis, and within the world of his dream, where he sets off on an adventure with Polka, a terminally ill young girl. The game begins mere hours before the date and time of the historical death of Chopin. He appears in the game as a tall gentleman that, in his dream, is dressed in an elaborate long coat and plumed top hat. In combat, he fights using an elaborate conductor's baton. He is voiced by Mitsuaki Madono in the Japanese version and Patrick Seitz in the English language version.
Chopin plays the most important role in Eternal Sonata. The game is set both outside and inside his dream world, and each chapter in the game is based upon one of his famous works, such as Raindrops or Revolution. As he lies dying of tuberculosis in the real world during his final hours on his deathbed, the players are taken on a journey through his dreams, which, though purely fantastic, take some inspiration from the events of his life. When Chopin first enters his dream world, he's quite convinced nothing can go wrong, yet he feels he must find a purpose to his dream. As he meets a young girl called Polka by the cliffs, who offers to help him find his purpose, they set off to an adventure in which he makes many friends.
In combat, Chopin is a well balanced melee and magic caster with the ability to heal.
As the game nears its conclusion, Chopin turns on his allies. Claiming that they are nothing more than the product of his imagination, he believes that it is by defeating them that he will finally be able to die. His role then switches from protagonist to antagonist, and the player must fight and defeat him as the game's final boss.