Soniaki is a fairly popular ship amongst the fandom, due to the number of canon interactions the two had. Fanfictions written for this ship usually make Chiaki and Sonia the soft, soothing, and calm lesbian couple, which is no different from their canon dynamic. A lot of people make fanfictions of Chiaki and Sonia older and as parents due to their peaceful vibe as friends. With their sweet and laidback personalities, a lot of people see them as loving mothers of children.