Lightfoot is a free-spirited and courageous unicorn. He is also one of Cara's best friends in Luster. He helped her when she first came to Luster, but is not with her when her new quest to retrieve her grandmother begins. Lightfoot is wandering, mainly because he wants to avoid the responsibility of serving in the Queen's court. It is eventually learned that Lightfoot is the heir to the throne of Luster, which is one of the main reasons he is wandering. Moonheart, his uncle, does not approve of Lightfoot's current choices and the two have an icy relationship.
Lightfoot cares deeply for Cara. As evidence of this he follows her and her travel companions as they start their quest. When they get into a fight with some delvers in the woods he has no choice but to rush in and safe the day. He does this again when Beloved captures Cara on earth. Lightfoot may be avoiding his duties to the Queen's Court, but he shows his strength and valor in the lengths that he goes to protect Cara.