Lemmy has pale aqua skin, blue eyes with pink eye shadow and turquoise body-tail with polka-dot pattern. She wears a blue spiral shell-shaped hat decorated by an aqua pearl. A transparent purple veil attached to the hat. She has a cyan clam-with-pearl symbol on her forehead.
According to Aisha, Lemmy is very shy, just like Flora.
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Lemmy was first seen with one of the guardians of Andros, when they were guarding the gate between Andros and Earth. Suddenly a large amount of toxic waste comes through the Gate with Phylla following behind. Phylla tells Lemmy to help her stop pollution before it makes things worse around Andros. They tried to use their powers, but oil still keeps floating towards the Andros prison, eventually being absorbed by Tritannus, who mutates the guards and steals Lemmy and Phylla's powers.
Lemmy makes an appearance of where Omnia was and trying to get away but Tritannus got there in time before she could escape. Herself and the other Selkies were trapped in a stormy barrier, preventing them to not leave it and were cover by something not letting them to speak. Then she and the Selkies showed the Winx where the hidden pearl was and stays outside to warn Omnia if Tritannus escaped with the pearl. She was last seen when they danced around in a line with Omnia.