Eureeka is the protagonist of Eureeka's Castle.
Eureeka is a sorceress-in-training who is constantly trying to improve her spell-casting skills. She is overzealous in using magic and often ends up casting unsuccessful spells that cause problems. Luckily, she has a can-do attitude and always fixes her mistakes.
Eureeka's skin is a peach color. Her blonde hair has faint streaks of light blue, yellow and pink. She normally wears a blue robe and has what appear to be a pair of goat-like horns growing from the sides of her head, just above her ears.
Eureeka appears in every episode of Eureeka's Castle.