True name: Θαλία Ἑλικώντης
Hobbies: Undermining her sisters' efforts, getting into fights, forming allegiances with nightmares
Summons: Trumpet, staff, smiling mask
Favorite food: “Who cares!? If you're feeling hungry, how about a knuckle sandwich?"
Dislikes: Fake cheerfulness, sugary happy endings, sentimentality, her sisters, herself

Formerly a light-hearted comedian and prankster, Lea has since renounced her role as a muse after a major disagreement between her and Cally. Lea now runs with the darker creatures of their realm, making allies and constantly trying to disrupt the other muses' quests. The other muses think it's just a rebellious phase that she'll “get over”; they have no idea how much Lea has actually done to undermine them. Lea would be willing to bury the hatchet if she received an unconditional apology from Cally, but nothing short of this would please her. Her biggest weakness is Tori, as Tori's previous incarnation took care of and protected Lea. While Lea would happily pick a fight with Cally or Polly, or even the elder muses, she won't hurt the youngest one.