Ren

Height - 175cm (in the game, in Sei's body) Partner - Aoba Seragaki.

As an ally, Ren takes the appearance of a small, dark blue Japanese Spitz dog. He has dark eyes that complement his fur, and is always seen with his tongue sticking out. Ren wears a collar with silver studs and a small syringe charm that Nine gave Aoba to clip into the center. He is often referred to as a "bunch of blue fur" due to his fluffy fur. Ren is one of the older allmate models, and is always seen with Aoba, constantly monitoring his health and safety.

During the Rhymed Battle, he takes on the appearance of a young man, thanks to his avatar's customizations. He has dark blue hair that resembles his fur, a hat that covers his eyes, and a large dark blue cloak that covers most of his body up to his knees. He wears light gray pants with a black belt and blue boots that are similar to his cloak. He is tall and has a very pale complexion. Without his cloak, he is very muscular and has numerous black tattoos that range from the sides of his face to his shoulder blades and down his arms. His ears are slightly pointed, and each has a large ring on them. He also has "delicate amber eyes" as described by Aoba, and sharp fangs.

Ren takes on the appearance of Sei. However, he begins to resemble a younger version of his rhyme appearance rather than Sei, which he mentioned would happen once his consciousness became firmly implemented in Sei's body.

Ren is shown to be very mature among all of his comrades, and even among humans to some extent. He is very passive in most conversations, usually taking things literally and misunderstanding certain statements, leaving Aoba to explain things to him. He maintains a calm demeanor throughout the game, even during fights, except when Aoba is suddenly in danger.

Despite his laid-back attitude, he is deeply conflicted about his feelings for Aoba and his duty to keep him in line. Ren also cares deeply for those around him. He and Beni share a casual friendship over Aoba and Koyaku's relationship, and he has several conversations with Tori. When Aoba confides in Ren about the men in his life (in their respective routes), Ren usually speaks about them with understanding and neutrality in order to help Aoba with his relationships.

As Ren becomes more and more human, he begins to smile and even laugh occasionally. He begins to experience emotions more clearly now that he is an independent physical being and not an Allmate or just part of Aoba. He gets nervous and embarrassed easily, especially around Aoba, due to the fact that he still retains many of his dog-like habits from when he was a sibling (holding things in his mouth, sniffing unfamiliar objects, etc.).