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It would be having the quirks underneath the player or to the side of the player's fielding shield. Kind of like 2k does with it's player models so we know what they're quirks are. I honestly think that this franchise has been behind when it comes to quirks or signatures compared to other sports games.
Ehh I don't thnik that offers much, hitting R3 tells you everything you need to know about their arms, I don't need a Quick Reflexes icon next to someone