Lily is one of Misty's three older sisters who lives in Cerulean City with their two other sisters, Daisy and Violet. After Misty, Lily's the second youngest of the four sisters, and she often teases Misty about her being the youngest of the four sisters.
Lily's very cheerful and is shown to be the most childlike and carefree of her sisters. She loves shopping, wearing cute clothes and acting out roles in plays, but she doesn't like to do battles.
She wanted to play the role of the mermaid during their underwater ballet, and not a pirate, but when Misty left, she and Violet take turns playing the mermaid in their performances.