1 hour ago, Tramp Graphics said:What makes you or Aris think Rei’s a girl? You can’t see Rei’s body because of the cloak, and Rei’s voice could be anything from a young woman’s to a teenage boy’s (think Rukia Kuchiki from Bleach or Jim Hawking from Outlaw Star ).
For me, there's a long list of statements that together strongly hint at female, and Aris doesn't think Rei is a teenage boy, I haven't seen either of those things you're referring to and if Rei turns out to be a teenage boy with an unusually high pitched voice then "his" gender must commonly be mistaken for female which "he" is used to and actively encouraging by using the cloak to hide what would be the only distinguishing feature of "his" armor.
Edited by EliasWindrider