Udongein

Udongein is a term primarily associated with the Touhou Project, a popular Japanese bullet hell shooter series. In this context, Udongein refers to Reisen Udongein Inaba, a prominent character within the Touhou universe. She is a lunarian rabbit, a type of inhabitant from the Moon who fled to Gensokyo, the fictional world where the Touhou games are set, after an incident on the Moon.

Reisen is known for her unique abilities, most notably her control over illusions and her powerful mind. She can manipulate the senses of others, causing them to see, hear, or feel things that are not actually there. This ability is often depicted as causing mental distress or confusion in her opponents during the series' gameplay. Her lunar heritage also grants her enhanced physical abilities, such as speed and agility, and a long lifespan.

Introduced in Touhou 8: Touhou Eiyashou ~ Imperishable Night, Reisen quickly became a fan favorite due to her distinctive design and intriguing personality. She is often portrayed as a loyal companion to Eirin Yagokoro and Kaguya Houraisan, the other lunar refugees residing in the Bamboo Forest of the Lost. Her character arc often involves her adjusting to life in Gensokyo and grappling with her past experiences on the Moon. Beyond her in-game appearances, Reisen Udongein Inaba has been featured in numerous Touhou manga, music CDs, and other related media, solidifying her status as one of the series' most recognizable figures.