Tetis

Tetis is a Nymph of Magix and one of the guardians of the Great Dragon. She hails from Domino and currently acts as its Guardian Nymph. She is one of the guardians of the Great Dragon, being the fourth Nymph introduced, after Daphne, Omnia and Politea.

Appearance
She has fair skin, long honey blond hair and brown eyes. She wears a pair of gold loop earrings. She also wears a long sleeve, striped yellow and orange top with wing collar, and a yellow skirt. Her wings are pink.

Personality
A bit naive, Tetis shows that she underestimates things but can be remorseful and accepting of consequences.

Pre-Comics
It is unknown when she assumed the position of one of the Nine Nymphs of Magix but she has since guarded the Great Dragon for years with Daphne and the other nymphs. It seems that she had continued to do so even during the absence of Daphne and Politea.

Comics
Sensing the increasing negative energy in the Great Dragon, she and Daphne try to keep the Dragon under control. Tetis assumes she will be strong enough to control it by harnessing its power. This is against the rules and rightfully so, because she could not control it, the Dragon's power was far too immense and becomes corrupted. This act exhausts Tetis and Daphne too from trying to nullify the negative energy. The Dragon begins waking up. The situation becomes dire because Princess Bloom, the current Keeper of the Dragon's Flame, enters the Great Dragon's lair and as a result of the tempering, she is extremely volatile and radiating so much negative energy that it awakens the Dragon. Dooming them all.

Tetis is blaming herself and Princess Bloom is about to unleash her fury onto her until the other Winx snap her out of it. The Winx and Daphne converge their powers to effectively nullify the negative energy surrounding the Great Dragon who then returns to its deep slumber.

After that was dealt with, she readies herself for her punishment only for Daphne to refuse to give it to her, reasoning that Tetis knows what she had done wrong and will become an even better, more responsible guardian. Tetis is happy and relieved that her superior was understanding.

Magical Abilities
As one of the nine legendary Nymphs of Magix and one of the guardians of the Great Dragon, Tetis wields formidable magic.

As the Nymph of Domino, she is able to wield the Dragon's Flame, and as an additional power, she can manipulate the Beast of the Depths, a creature who wields power stronger than the Dragon's Flame.

Trivia

 * Her name is of Greek origin and derives from the Ancient Greek name Tēthýs (τηθύσ), and in Greek mythology, there is a titan named Tethys.