Lily is one of Misty's sisters, along with Daisy and Violet. She's the third oldest of the four sisters.

She made her debut appearance in The Water Flowers of Cerulean City along with Misty's other sisters. She is also one of the three temporary Leaders of Cerulean Gym. Both she and Violet tend to tease Misty more than Daisy does, and she also plays boyish roles in their water shows whereas Violet plays the more girlish ones.

She made many more appearances along with Daisy and Violet in future episodes as well as in the Pokémon Chronicles.