Who is yunalesca?

Yunalesca is a character from the video game "Final Fantasy X," developed by Square Enix. She is a significant figure in the game's lore, serving as the first Summoner to defeat Sin and later becoming an antagonist. Yunalesca embodies the themes of sacrifice and the cyclical nature of suffering, as her methods to combat Sin ultimately perpetuate the cycle of death and rebirth. Her character is central to the game's exploration of fate and the moral dilemmas surrounding the use of power.