Asia Argento is a significant character in the anime series High School DxD. She is a former nun who possesses a Sacred Gear called Twilight Healing, which grants her the ability to heal others. After being excommunicated from the Church, Asia is reincarnated as a Devil by Rias Gremory, the protagonist's master. Despite her new identity, Asia remains kind-hearted and deeply caring, often seen supporting her friends. Her innocence and compassion play a crucial role in the series, making her a beloved character among fans.