Peter Pevensie
The oldest Pevensie and the one who struggles most with being back in a world where he was once High King. He has to lead again without the certainty he had before. His single combat with Miraz is his defining moment: he fights well but can't fully control the outcome.
Lucy Pevensie
The youngest Pevensie and the first to see Aslan. She's right when everyone else is wrong, and she pays a social cost for it when the group ignores her. Her arc is about holding to what she knows even when no one backs her up.
Edmund Pevensie
Edmund is steady and practical here. He's the second to believe Lucy about Aslan, and he fights well throughout. His earlier betrayal in the first book is behind him; he's now the reliable one.
Susan Pevensie
Susan is skeptical and cautious. She's one of the last to see Aslan and one of the hardest to convince. The book hints that her relationship with Narnia and with faith is already becoming complicated, which sets up her absence in later books.
Prince Caspian
The rightful heir to the Telmarine throne, raised on secret stories of Old Narnia. He's young and untested but genuinely wants to restore what was lost. His leadership is tested constantly, and he has to resist bad advice at several key moments.
Aslan
The great lion who created Narnia. He's less present in this book than in the first, which is part of the point. Characters have to act on faith before he shows up fully. When he does arrive, he changes the battle completely.
Miraz
Caspian's uncle and the usurper king. He's a capable ruler and a dangerous opponent, but his vanity makes him vulnerable. He accepts Peter's challenge partly because his own lords manipulate him into it, and that decision gets him killed.
Trumpkin
A Red Dwarf who starts out skeptical of Aslan and the old stories but proves loyal and brave throughout. He's the children's guide and a practical counterweight to the more mystical elements of the plot.
Nikabrik
A Black Dwarf who represents the darkest response to desperation. He never fully trusts Caspian or the old ways, and when things look hopeless, he turns to the White Witch. He's not cartoonishly evil; he's a character who lets fear make his choices.
Doctor Cornelius
Caspian's tutor and the one who secretly teaches him about Old Narnia. He's half-dwarf, half-human, and lives between two worlds. He sets the whole plot in motion by warning Caspian to flee.