 According to an author's note, Takaya designed Akito and Ren to resemble each other; Shigure claims that if Akito had been raised as a woman, she would have looked very much like Ren, and Tohru once mistook Ren's voice for Akito's.Ren and Akito are extremely antagonistic towards each other; Shigure notes that she is obsessed with her child and dead husband.Her background and age were deliberately left vague by Takaya.