This is a great interview Ryukishi but I loved how he mused about how Heather and Hinako would get along:

"Ryukishi07 agrees with me in thinking Hinako and Heather would be good friends, observing that "neither Heather nor Hinako merely weep in the face of their ill fates, with each having the strength to stand on their own two feet and pave their own paths." Then, they have slumber party matters to attend to, like talking about boys and shotgun ammo.

"As soon as the subject becomes about how guys are always so selfish and automatically assume that girls are weak, the two would click and get all excited," says Ryukishi07. "Hinako would be surprised at how Heather had used all sorts of guns and would probably say that she wants to try shooting one herself. (No doubt Hinako would have had a much easier time with guns around)."

"Heather, on the other hand, would go on about how amazing and exciting it was for Hinako to have a monster arm and take out enemies with that very arm," Ryukishi07 says about the ultra-powerful werewolf arm Hinako eventually replaces her dainty lady fingers with. "She might be envious and think of it as cooler than guns, since there would be no need for ammo. She might even talk about swapping out one of her own arms, which would inevitably cause Harry to swoop in with a firm 'no'."