Coriakin

Coriakin is a star who is in disgrace for unexplained reasons. Aslan hints at it when He speaks with Coriakin on the Island of the Dufflepuds, but it is not made clear until Ramandu explains later that Coriakin's rulership of the Duffers is a punishment. And yet his punishment is not abasing; he is given a charge of some trust in ruling the Duffers' island. Though the Duffers can be very trying, Coriakin speaks of them with affection. He is quite friendly to Lucy when he finds her in his study reading his magic book, and uses his skills for the benefit of the explorers when he creates the map of their travels. Though he is slightly weary of his punishment, Coriakin bears it well, and it would seem that whatever his sin had been, he had learned from it and was eager to obey Aslan in the steps of the Great Dance in the sky once more.