Once I learned I learned of Iris, I scrolled back to look at the demon lord again and nothing about the way she was drawn is contradictory to her being a woman before. So not a trap.
Genderbender? Genderswap? Dudes... Irisphilia is obviously a female name.
If you check how the Demon Lord is drawn its obvious that it is drawn in the most generic way possible. Dont even pay attention to it.
Iris is the Demon Lord reincarnated right? Everything from not knowing how to make friends, to not having common sense, and even now liking to shorten people's names is pointing at that fact!
@Dan93 we don't know for sure. Afterall if he (now she) was reborn it doesnt mean she keeps a male mind even if she retains the memories of her past life