Edmund Pevensie
Edmund talks cruely to Lucy when she first finds the entrance to Narnia through a wardrobe, and is the second of the Pevensie children to go to Narnia, after following Lucy so he could tease her. While there, he meets Jadis, the White Witch (who introduces herself as the Queen of Narnia) and he gets to eat some magical Turkish delight, which causes an addiction in the person who eats it. After that, he promises the White Witch that he will bring his brother and sisters to her castle, not knowing that she was intending to kill them all to prove a Narnian prophecy. Lucy did mention the White Witch in a conversation and Edmund realizes that the witch was none other than the "Queen of Narnia", but the magic of the Turkish Delight was so strong that he decided to go to the castle for more.