Shizuku Koga
About
Shizuku is Naoto's daughter. She is quite mature and responsible for her age, and calls Naoto "mommy" and Hazuki "Ha-kun".
After Minato is born, Shizuku takes her role as a big sister very seriously. She eventually takes Hazuki's last name, when he and Naoto get married.
After her second gender examination reveals her to be an alpha, Shizuku worries that it will drive a wedge between her and Naoto, as he is afraid of alphas. However, Naoto reassures her that it changes nothing between them.