this is a PSA thread to gather all information i’ve found regarding nkym’s gender and sexuality and naki’s gender, please RT!!
TL;DR: nkym satsuki is non-binary, asexual and aromantic, naki is agender

https://lineblog.me/nakayamasatsuki/archives/1467406.html 2019/01/12 ‘asexuality’
nkym details how they discovered they were asexual and aromantic.
https://lineblog.me/nakayamasatsuki/archives/1505894.html 2019/03/27 ‘asexuality, continuation’
nkym explicitly says being seen as a woman makes them sick.
read my TLs here https://twitter.com/ne0dym/status/1236034382126813184

https://live.line.me/channels/561423/broadcast/13214898 2020/03/24 line live
06:30 nkym says they believe naki has no gender, because they are a robot.
38:00 nkym says they were born a woman but does not see themself as a woman. they view their gender as simply ‘nakayama’.

https://live.line.me/channels/561423/broadcast/13317101 2020/04/05 line live
17:30 nkym states clearly their gender does not match the sex they were assigned at birth.

these bits from the official metsuboujinrai book
1: nkym says naki, as a humagear, is neither female nor male
2: nkym tells the other cast members naki has no gender
3: producer oomori says it was decided that naki would have no gender

https://voguegirl.jp/lifestyle/people/satsuki-nakayama-interview/#!/p/1/ 2019/04/25 vogue girl interview
nkym says they don't feel like neither a man nor a woman, so they don't think the word 'genderless-woman' (specific word for fashion trend where women wear men's clothing) describes them.

this very recent tweet was really shocking. this was my rough translation
'the reality that i'm a woman was so painful i've almost given up on living more than once. so i can only live happily when i'm not thinking about it.'