So i'm going to do this question by question. As this gets done, their Bio pages will be updated with the new information.
Question 1: What is you Nickname?
Kotori - Kotori, Shiisan, Shiizaburou, buuko, kojjan, koburi, shibo
Momona - Momo, Momonga, Momoko, Namachan
Akira - Akira
Mikoto - Mikocchan, Miichan
Yuuno - Yuuno, Yuutan