Illiris has tan skin, purplish blue eyes with pink eye shadows, orange lips and orange body-tail with striped patterns. She wears an orange spiral shell-shaped hat decorated by a pink star. A transparent yellow veil is attached to the hat. She has yellow symbol on her forehead, which consists of a big yellow star, attached with three smaller yellow stars.
According to Stella, Illiris has a great sense of humor, just like her bonded fairy.
When Tritannus tried to enter Solarian gate, he was stopped by Illiris. They had a quick duel of which Tritannus had won thus losing her powers. Later on, Lemmy introduces Illiris to Stella; they both bond,
Winx Club: The Mystery of the Abyss
Illiris 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 herself and the Selkies followed to the Winx where the hidden pearl was and stays outside to warn Omnia if Tritannus escaped with the pearl. She was last saw when they danced around in a line then Omnia.
- Issue 104: The Mirror of the Sea
- Issue 105: The Jaws of the Abyss
- Issue 110: The Magical Valley of Linphea
Illiris, with the aid of the star symbol on her forehead, she can close and open the gate to Solaria, enter the Infinite Ocean and shoot orange/yellow energy bolts. She can also converge her powers along with other selkies as seen in multiple episodes in Season 5.
As seen in "The Emperor's Throne," she and the other selkies can converge their powers to give the Winx a power boost.
- Illiris's name is a reference to the word illuminate, which is understandable since she is the Keeper of Solarian ocean gate, the planet of sun.