So a weird question, why do the protagonist stand at the right side instead of left like most RPG battle screen do?
Just the convention from a lot of Japanese games I was emulating that I carried through. If I had to guess, it might have something to do with them reading right to left instead of left to right, but that's just a guess. For what it's worth, these kind of games also require a really large and detailed player character sprite, and I think it feels more "balanced" to have that on the right than on the left for some reason.