Reisen Udongein Inaba (鈴仙・優曇華院・イナバ) is one of the moon rabbits who fled from the Moon to Earth as a refugee from the "Lunar War" between the two worlds that began in 1969 A.D. after the Apollo 11 "invasion". Making her way to Gensokyo, she was surprised to meet the notorious fugitives Kaguya Houraisan and Eirin Yagokoro, and asked for asylum in Eientei. In exchange, she works for and protects Kaguya and Eirin.

Reisen first appeared as the Stage 5 boss Imperishable Night and later became playable in Phantasmagoria of Flower View, Scarlet Weather Rhapsody, Legacy of Lunatic Kingdom and the PlayStation 4 version of Urban Legend in Limbo. She also appears in many official manga such as Silent Sinner in Blue and Cage in Lunatic Runagate.

"You're too late. I've sealed all the doors. You can't take the princess away now, can you?" — Reisen Udongein Inaba (Imperishable Night Stage 5.)

Image Credit: YouTube- Touhou Animation - Reisen Rizz by Sader.