Kasen Ibaraki, who also goes by the pseudonym Ibarakasen or just Kasen, is the main protagonist of Wild and Horned Hermit. She is a mysterious self-proclaimed hermit living in the mountains. Possessing an artificial arm and various special abilities, she can often be seen dispensing knowledge to Reimu Hakurei, Marisa Kirisame, Sanae Kochiya and others.

Kasen is also a Sage of Gensokyo and is confirmed to be an oni and one of the Big Four Of The Mountain 