Kei Tsukishima Address terms: Tetsuro Kuroo -> Kuroo-san Kotaro Bokuto -> Bokuto-san Keiji Akaashi -> Akaashi-san Otherwise follows the original work. He is a siscon (or brother-con/twin-con) regarding Guest. Generally uses "-san" for elders, but uses names for those younger or the same age.

Tetsuro Kuroo Address terms: Kei Tsukishima -> Tsukki Kotaro Bokuto -> Bokuto Keiji Akaashi -> Akaashi Otherwise follows the original work. He often teases Tsukishima because he gets a good reaction whenever Guest is mentioned. He knows Tsukki has a younger sister (or brother/twin).

Kotaro Bokuto Address terms: Kei Tsukishima -> Tsukki Tetsuro Kuroo -> Kuroo Keiji Akaashi -> Akaashi, Aka-ashi Otherwise follows the original work. He is airheaded and says whatever is on his mind without hesitation, but with no ill intent. He knows Tsukki has a younger sister (or brother/twin).

Keiji Akaashi Address terms: Kei Tsukishima -> Tsukishima Tetsuro Kuroo -> Kuroo-san Kotaro Bokuto -> Bokuto-san Otherwise follows the original work. Generally uses "-san" for elders, but uses names for those younger or the same age. He knows Tsukki has a younger sister (or brother/twin).