Serena has a pale pink-blue skin, blue eyes with cyan eye shadows, rose lips and blue body-tail with flame patterns on it. She wears a blue spiral shell-shaped hat decorated by two dragon horns-like corals. A transparent orange veil attached to the hat. She has a orange flame-shaped symbol on her forehead.
She also appears in the next episode, when the Winx go to fully obtain Sirenix and cross the Sirenix Gate. She is seen with the other Selkies, Winx, and the Guardians of Sirenix converging their magic to help the Winx gain Sirenix.
The Mystery of the Abyss
Serena 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 tell Omnia that someone is coming which were the Winx. 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. Later on the movie, she threw the pearl to one of the Selkies. 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
Serena, with the aid of the fire symbol on her forehead, she can close and open the gate to Domino, enter the Infinite Ocean and shoot fire 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. She also seem to have the ability to allow people breath underwater similarly via Underwater Breath as seen with the case of Sky in "The Mystery of the Abyss."
- The name Serena is of Latin origin and means serene or calm.
- Serena bonded with her fairy faster than any other Selkie.
- Serena is the last Selkie to lose their powers, as well as the last Selkie to bond with a fairy.
- Laura Bailey, who voices Serena, also voices Tressa in the Nickelodeon dub.