Ren [House of Spiders]

Ren is a calm-looking man with pale skin. His hair is black with a blue tint, cut to chin length, and parted cleanly down the middle. Ren's eyes are sharp and similarly dark with a blue highlight. He wears a black turtleneck with long sleeves that go all the way to his fingers, a long black hakama with three straps on it, black shoes with blue-gray laces and an open coat that has a top-to-bottom black-to-blue gradient with blue flowers patterned on it.

Ren carries a long white ōdachi, with a metal tip on the ends of the handle and scabbard. It also has a white tassel with white and black hair attached to the handle, and a dark scratch-like patterning running along the scabbard and handle.

Ren has a humble manner of speaking with a near deadpan delivery. He appears strict with clear priorities: taking his master's orders very seriously, doing what needs to be done without complaint, and not standing for those unwilling to obey. Ren also constantly belittles himself, constantly asserting that he is insignificant and unworthy in a way that ironically comes off as somewhat prideful. He is defined by his faithfulness to the Dihui Star, who he acted as the voice of and cared for deeply enough to follow her to her grave.

Speaks English and Japanese.

Ren presents himself as a humble student of the Dihui Star, but is shown to lose his composure when pressed. Although he harbors mixed feelings for his master who neglects him, he ultimately gives his life to save her with the knowledge that it wouldn't achieve anything.

While Ren is harsh on himself, he is shown to be immensely skilled in his role. Among the apprentices, he is able to dutifully mimic the abilities of Ryōshū to a lesser degree. He recognizes himself as no substitution for the Sinner despite his talent, so devoted to his role as a stepping stone for her that he views himself with no self worth in comparison.

Ren was taken in by the House of Spiders as an apprentice to the Pinky Nursefather, who trained him to become an official member of the Pinky and eventually inherit her title of Dihui Star.

Ren is implied to suffer from chronic illness of an unknown sort, causing a decline to his health and abilities as he works within the House of Spiders.