Ren
Aoba’s All-Mate, an all purpose computer that can take various forms. Aoba considers him a dear companion and personally maintains him. They’ve been together for as long as Aoba can remember. His breed is a Japanese Spitz.
For some unknown reason, he takes human form within Rhyme.
Ren is the main partner of the secret, unlockable route which is also the true route of the story.