Prince Caspian is the young nephew of King Miraz and the rightful heir to the Narnian throne. Raised in a Telmarine castle, he harbors a deep curiosity about Narnia's ancient history and the talking beasts his uncle dismisses as nonsense. He is humble, compassionate, and desperate to help the hidden "Old Narnians" reclaim their land from his tyrannical family.

King Miraz is the cruel and tyrannical ruler of Narnia who seized the throne after murdering his brother. He enforces a regime that oppresses the magical creatures of the land and actively attempts to suppress any historical memory of Aslan or the Pevensie children. He views the natural world as a threat and values power and control above all else.

Doctor Cornelius is a small, stout scholar with a silvery beard who serves as Prince Caspian's tutor. Secretly part-dwarf, he educates Caspian about Narnia's true history and the surviving magical creatures hiding in the forests. He possesses a mysterious background and simple magical abilities, providing Caspian with the guidance and tools necessary to escape King Miraz.

Lucy is the youngest of the Pevensie siblings and the most intuitively connected to Narnia's magic. She possesses a deep sense of faith and imagination that allows her to perceive things her older, more rational siblings cannot. She carries a magical diamond bottle of healing cordial gifted to her by Father Christmas during her previous reign as queen.

Susan is the second oldest Pevensie sibling and often assumes a practical, motherly role among her brothers and sister. She struggles with her return to Narnia, frequently preferring rational explanations and caution over childlike wonder. She is a highly skilled archer, carrying a magical bow and arrows from her previous time in the kingdom.

Peter is the eldest Pevensie sibling and the former High King of Narnia. He feels a strong sense of responsibility to protect his siblings and assist Prince Caspian in liberating the Old Narnians. He fights with his original sword, Rhindon, and relies on his strategic judgment and combat skills to lead the resistance against the Telmarine army.

Edmund is the younger Pevensie brother, having grown significantly more mature and humble since his first adventure in Narnia. Having learned from past mistakes, he is now open-minded and willing to trust Lucy's intuition even when he lacks his own proof. He is a capable swordsman who readily cooperates with his siblings in combat.

Trumpkin is a practical and cynical dwarf serving as a messenger for Prince Caspian. He frequently uses colorful, alliterative exclamations and requires tangible proof before believing in ancient magic or Aslan. Despite his initial doubts about the Pevensie children's abilities, he is humble enough to admit when he is wrong and remains fiercely loyal to Caspian's cause.

Aslan is the great, magical lion and the ultimate authority over Narnia. He acts as a divine creator and protector, working miracles that heal the suffering and awaken the natural world. He challenges his followers to act with courage and faith, arriving to assist the Old Narnians not through open warfare, but by restoring life and joy to the oppressed land.

Nikabrik is a sour dwarf with black hair and a thick beard who deeply resents the Telmarines for their oppression of his people. He is suspicious of humans and evaluates all alliances solely on whether they benefit dwarfs. His hatred for King Miraz drives him to consider dark magic and unsavory partnerships as a means to an end.

Trufflehunter is a talking badger who maintains a steadfast belief in Aslan and the old laws of Narnia. He acts as a voice of tolerance and wisdom among the Old Narnians, reminding the dwarfs that generalized hatred toward humans is wrong. He is instrumental in welcoming Caspian and organizing the woodland creatures.

Reepicheep is a talking mouse who stands over a foot tall and carries a rapier at his side. He is an exceptionally polite but fiercely brave warrior who constantly seeks to prove his valor in battle against the Telmarines. He treats his whiskers and tail with intense pride and views martial combat as a matter of high honor.

Prince Caspian's former nurse is a kind, elderly woman who cares for the young prince in King Miraz's castle. She instills in Caspian a love for Narnian history by sharing secret tales of talking beasts and the golden age. Her stories lead to her dismissal by King Miraz.