Eyes are the windows to the soul and all that. But there are quite a few characters in various animated series whose characters backstories all involve losing said right eye. To avoid spoilers in the OP, I won’t name any of them, since my main question is that is there something in Japanese mythology that gives the right eye some sort of importance (what I’ve been able to find is that the moon was born from one of the creator gods’ right eyes, and the sun from the left)? Or was there an early anime in which a character loses his right eye in some sort of Important and Meaningful Event, and the other anime are referencing this?
(Yes, there’s also a large number of characters with scars on the left side, but since most of the world is right-handed that’s where I’d expect injuries to occur.)