“When the threat of monsters at the gate has darkened out the sun, let the kingdom find some peace and joy in Festivia the Fun.”
―Royal family inscription[src]
Festivia Cosma (né Spiderbite), also known as Festivia the Fun, is the 30th Queen of the Kingdom of Fairy World and Timmy's sixth great-godgrandmother. She is first featured in tapestry in "The Past and the Furious", and her history is expanded upon in "Fairy Trap" and The Fairly OddParents!: The Magic Book of Spells.
Festivia is described as being a total party girl through and through. She has a cheerful disposition and cannot stand to see others upset. This also implies that she is considerably ignorant and naive, since she never questions her own origins and believes the Magic High Commission's lies regarding her parents.
Like most fairies at the time, she saw the monsters as the villains of their age-old conflict, claiming they had "started it", even when the monsters tried to take back the land the fairies themselves had taken from them.
As revealed in "Eclipsa and Wanda" and "Fairy Trap", Festivia was born a fairy peasant. After Eclipsa Fairywinkle was found guilty of crimes against Fairy World and frozen in crystal, her husband King Shastacan wanted nothing to do with Eclipsa's half-monster daughter Meteora. The Magic High Commission replaced her with Festivia as heir to the throne, and Festivia inherited the Royal Magic Wand and was raised by the Commission to be Queen of Fairy World.
According to The Fairly OddParents: The Magic Book of Spells, Festivia lived somewhat of a sheltered life within the Fairywinkle Kingdom, raised to believe that Eclipsa and Shastacan were her birth parents and that they were devoured by monsters. Despite this, she grew up very cheerful and starry-eyed, frequently throwing parties at Cosma Castle with fellow Fairy World royals.
As war against monsters waged outside the kingdom, Festivia was kept inside the castle gates, closed off from the outside world. She became known for holding non-stop parties in the kingdom to keep her subjects happy and untroubled by the battles being waged outside the gates. In her sixth year as Queen of Fairy World, she married Prince Musty Mountains, and she later gave birth to two daughters: Dirhhennia and Crescenta.
In "Into the Wand" and "Ghost of Fairywinkle-Cosma Castle", Festivia is very briefly depicted in tapestry in the Butterfly Castle's "Grandma Room". In "Escape from the Pie Folk", Festivia is revealed to be one of the Pie Folk of Pie Island who was accidentally abandoned at a Pie Carnival before being taken in by King Shastacan and raised by the High Commission.