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How would you change character customization going forward?
I'd allow for the option to adjust age and body size/shape. You'd be able to make your character short and fat, or tall and skinny.
Also when you defeat major characters in the story, you'd unlock their outfit and/or hairstyle. Imagine if you beat Lysandre and had his hair.
Finally, assuming the game has a gimmick with an accessory item, I'd allow the player to customize those accessories (like wearing a Mega Pendant or something.)