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Ichirin Kumoi is the midboss and boss of Undefined Fantastic Object's Stage 3. Her personality is described as straightforward and quick-thinking, allowing her to adapt to most situations with ease.
Unzan is Ichirin's nyuudou partner. He is literally a gigantic, angry pink cloud with fists and a face, but ZUN describes him as a "gentle old man at heart." The two work together during the boss battles.
During the events of Undefined Fantastic Object, Ichirin and Unzan were acting as guards for Byakuren's ship, to keep out anyone trying to keep her from being revived. She initially thought the heroines were attempting to stop her, but upon realizing they had some parts of the treasure needed to unseal Byakuren, she assumed they were on her side and happily let them through.