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It depends on how the gradient would actually effect color since the show just put an inversion filter over the animation instead of actually animating in black and white
By itself it’s a better byakugan combined with a genjutsu-less sharingan which is still pretty good especially since it can help you maximize energy efficiency with the right training. It was only op if you also had the limitless because the eyes can effectively do most of the calculations for you just due to the level of information you are processing, meaning that you can use what is effectively invincibility limitlessly.
I’m pretty sure elite jonin is a weird translation of tokubetsu jonin, which are jonin who earned who became jonin because they massive excelled in one area or another but didn’t meet typical jonin requirements in other skills
Ironwood is called that because it has durability similar to iron and when fighting a polearm it is easier to cut off someone’s fingers than it is to cut the blade off in such a way that it doesn’t turn into a sword or dagger.
I don’t think most gods in Teyvat have a set gender as they are often personified elements or powerful creatures that don’t necessarily have a social concept of gender.