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Katy is a fair-skinned girl with chest-length, brown wavy hair. Her eyes are dark. Katy wears a pink midriff tank top and a knee-length pink skirt. She has her hair down with two small pigtails, and also wears a blue scarf.
At the dance, Katy wore a pink tank top with two very thin shoulder straps, along with a knee-length matching pink skirt that was worn underneath her top. She has on dark magenta gloves stopping just before her elbows. Her hair is pulled back and straightened with a small flip along the edges, along with having two very thin loops of hair on top of her head, resembling mouse ears. Her shoes are high heel sandals the same color as her dress.
She wears light blue long socks, long beige boots with high heels, a short sleeve beige jacket with pockets over a lavender short sleeve shirt, and beige shorts with pockets and a brown belt.
Katy wears a long light blue short sleeve shirt with a yellow circle on the front and pink shorts. She also has on a long pink fingerless glove on her right hand.
Katy wears a torn, fur-like yellow-beige top with a point on the bottom and a torn, fur-like yellow-beige skirt that has squares on the ends and has a white and yellow cat tail. Her shoes are gold and yellow boot-like shoes with open-toes and are torn. She also wears a blue choker with a gold bell and dark blue tear-fur bracelets with cat ears on her head. Her wings are navy blue with white outlines at the edge of it.
In "Alfea College for Fairies," she is seen in Professor Wizgiz class. She applauded for his display of magic. When Wizgiz shared with each student a mirror, Katy seemed happy and concentrated on the class. She was later seen at the dance.
In "Date With Disaster," she and her classmates were in Wizgiz's class, morphing their heads into pumpkins. With Wizgiz's guidance all her classmates were able to revert back to themselves, except for her. She begs her professor to help her and Wizgiz does so by scaring her with his mouse.
In "Honor above All," she is seen in Professor Wizgiz's class as they complain about an upcoming pop quiz.
As the Fairy of Animals, Katy has animal-based powers. She is capable of healing sick animals and can speak to them. Because her magic comes from animals, she can bond with them more quickly.
Katy may know some basic, first-level spells that all fairies can use, such as telekinesis, transmuting objects, and fixing minor messes.
- Her names has Greek origin, is a variant of "Catherine", "Katherine" and "Katie", and means "pure".
- Her name could be pronounced as Cat-y.
- Katy has been seen at Cloud Tower, so she could be a transfer student or it could be a character error.
- On the Winx Club website, you could dress up your avatar with Katy's fairy outfit, however it is called "Cat Halloween Costume".
- Katy's fairy form may be a reference to Momomiya Ichigo from Tokyo Mew Mew.
- Katy is the first known Fairy of Animals in the series, the second being Roxy.