Nasubi is Karauri's inadvertent colleague. Nasubi can't seems to be able to focus on the given task for a long time and can get easily distracted, which leads him to make mistakes during work.
As pointed out by Karauri, Nasubi is an award-winning artist. However, he chose the job of a minion as it provided stable income for his poor family background.
He is also adept with various paint and craft mediums. His muse and idol is Katsushika Hokusai.
(Source: Hoozuki no Reitetsu Wikia)