Ruri'iro Kujaku's manifested spirit take the form of a light-skinned, fairly muscular man with gray eyes and blue hair, which frames his face with two long bangs and is tied in a long braid with a strip of red fabric at the back. He has an orange mohawk running from the top of his head to the back of his skull, and has tan fabric wrapped around the top half of his head. He has dark fur covering most of his back, his arms, and his sides, and has long green feathers tipped with orange and yellow on his forearms and waist. He wears tan, calf-length boots segmented by a spiral design.
While under the influence of Muramasa's brainwashing, Ruri'iro Kujaku is polite and friendly toward others. However, he becomes visibly angry and frustrated if someone is rude to him or ignores him. He is on good terms with Hōzukimaru, who usually calms him down whenever he becomes angry. He occasionally speaks for Wabisuke. He does not like Kenpachi Zaraki's style of fighting because he believes it is rough and lacks finesse.
Ruri'iro Kujaku hates Yumichika Ayasegawa for always using his "insulting nickname" of Fuji Kujaku, and admits to looking forward to killing him. However, he still acts polite and friendly toward Yumichika upon encountering him, offering him fashion advice and complimenting his appearance, though doing so in a mocking manner. Regardless, he becomes irritated when Yumichika refers to him as Fuji Kujaku, and claims he will kill Yumichika if he continues to do so. Additionally, Ruri'iro Kujaku claims Yumichika was the source of his stress. He is very critical of Yumichika's power and stubborn nature, and claims he left him because of how Yumichika tries to hide his true nature and power. He is very mocking toward Yumichika when fighting him, and constantly belittles his power. However, Ruri'iro Kujaku admits he and Yumichika are very alike because of their views on aesthetics and beauty, and even offers to make their fight a fair one by letting Yumichika use Ruri'iro Kujaku or not using it himself. Yumichika notes Ruri'iro Kujaku is as stubborn and overconfident as he is.
After being freed from Muramasa's brainwashing, Ruri'iro Kujaku is on much better terms with Yumichika, though they maintain a rivalry in battle, each trying to take down more Gillians during their defense of the Human World.