When you have a heir that has certain looks, you can king them first. While he is king, you can perhaps work on training up a high stat lion to take the place of the looks king. When you go to king the stat replacer, you have to be careful you are using the kings appearance, not the chosen heir. Any mutations that the first king had will be gone, unless the stat replacer has a mutation, then it will be sustained. :)
Hope this helps! <3

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