Fujiwara no Mokou is a prominent character in the Touhou Project series, first appearing in 'Imperishable Night.' She is an immortal human who gained eternal life after consuming the Hourai Elixir. Mokou is known for her fiery abilities and her longstanding rivalry with Kaguya Houraisan. Living in the Bamboo Forest of the Lost, Mokou is a solitary figure who often helps lost travelers. Her immortality and tragic past make her a compelling and complex character in the series.