Stella is Princess of Solaria and Fairy of the Shining Sun. She was the first to discover Bloom was a fairy, after the latter aided her against the ogre Knut. Stella convinced her new friend to register at Alfea with her, thus forming the foundations of the Winx Club. While generally vain and self-centred - as well as obsessed with fashion and shopping - she is nonetheless a loyal friend, always willing to step up when needed.
(Note: While Lisa Adams is confirmed to have voiced Stella for several episodes in the 4Kids dub - likely during Season 3 - it is at present unclear which episodes she appears in. So, until that is cleared up, she will not be added.)