Thread:YoRHa No.2 Type B/@comment-10733658-20170603124718/@comment-26051487-20170603130109

In Mayuzumi's case, I called them a girl on a whim because I thought the name sounded like a girl's. It was just my guess, so I'm sorry if what I did was too rash.

In Kou's case, in the Mangastream translation, Naki does refer to Kou as a male when he brings him to Tsukiyama.

Tsukiyama: This little one, I presume?

Naki: I grabbed him from up there. He was under attack. Takin' in ones like 'im is part of the king's way of doing things, right?

Though, I'm totally fine if you removed their genders for the time being until we get more confirmation.