River Sprite is the default Little Legends skin provided. Currently, it is the only Little Legend with only 1-star variants. Its basic variant is also the only Little Legend not usable in ARAM.
You can unlock skins for this Little Legend by purchasing a Little Legend Egg, which costs 490. Cracking open your egg will grant you a random tier-1 unlock from the pool of available skins, including their original skin. Obtaining a duplicate will upgrade your skin to the next tier, up to tier 3, at which point the skin is removed from the reward pool.
UFO Sprite has visiual similarities with Invaders skin universe.
Star Guardian Sprite was inspired by with Star Guardian skin universe.