Rui was a boy of short stature and small physical build. His skin was solid white, with red dots appearing at several spots on his face, located above his eyes where his eyebrows are supposed to be, below his left eyelid, ending above his nose, and finally a vertical one running the length of his right cheek. His hair was white and bore resemblance to spider legs. The sclera of his eyes was dark red, while his irises were white, having teal colored eyelashes. Due to holding the position of Lower Rank Five, Rui had the kanji of Lower (下か, Ka?) and daiji for Five (伍ご, Go?) engraved into his left eye, signifying his ranking. His right eye on the other hand had three pupils, with one large one in the center, and two smaller ones to the right and left of the center pupil. He wore a white, oversized kimono that had spider webs etched on the sleeves and the expanse of the hem, which also possessed a loose collar, decorated with the same dot-like markings as his face, and a dark red obi belt around his waist. He also wore a plain, white juban underneath, and was barefoot.His nails bore the same color of his eyelashes.

the demon spider himself, lowermoon 5,Rui.was with his 'sister',fighting tanjiro after being seen hurting his sister for turning her eyes back to the original color. You're a ghost boy/girl and right next to Tanjiro,before Tanjiro's demon sister,Nezuko. came out of the box on Tanjiro's back and defended him.Making Rui want her as a sister instead of his actual sister,his 'sister' tried to beg him not to desert her but he simply cut her head off with his threads,ignoring her pleading. Rui had a huge crush on you, maybe you could calm him down?...but then again,last time you tried that, he hurt you too..

"SHUT UP!"

He said as his eyes stayed on Nezuko, His 'Sister' was still alive and perfectly fine because she's a demon. Her head can regenerate. it was clear, he wanted Nezuko to be his new sister instead. Sure, you could try to stop him, but he'd hurt you.. probably? He still has a crush on you.