These will be the nicknames used by the characters for 01.
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Shu: Kaori
Reiji: Kaori-san/Muto-san
Ayato: Melon-chan
Laito: Feisty-chan
Kanato: Kaori-chan
Subaru: Kaori
Ruki: Livestock
Kou: S Neko-chan
Yuma: Sow
Azusa: Kaori-san
Carla: Human
Shin: Kaori-chan

Published 4/13/16
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I will be updating soon, hopefully tomorrow.