Unfortunately there is no way to change your characters eyes, hair style, hair colour, gender or skin colour. The only thing you can change is your name by purchasing the name change book from the cash shop.
You can edit the pak files and switch out the hair/eyes you have with the hair/eyes you want, however this will only be shown on your end. Everybody else will still see you as having the hair and eyes you chose when you made the character.
If you want to truly change your look, you'll have to remake.
104