Hourai is not a standard personal character in Touhou Project, but refers to the mythical Hourai, a legendary paradise and concept tied to immortality in the series. In Touhou lore, Hourai is most strongly associated with the Hourai Elixir and the idea of eternal life, especially through characters like Kaguya Houraisan and Fujiwara no Mokou. As a concept rather than a single person, Hourai represents unattainable immortality, mystery, and the consequences of defying natural life and death.