I wanted to suggest a mutation: Piebald.

Heavy(large amount), or Light(small amount), swatches of white, that blot out most of the other markings/color of the lion(ess), and leave these large circles of color instead.

These markings could be any shape, or size, giving you free reign on how they should look, or how much they cover. But I think it would be nice to have a piebald marking that takes over a large portion of the lion's body, leaving a small bit of color showing.

Example A chart someone made of piebaldism in deer. I show it to give example of how the range in severity could be, or how the shape could be.

It would appear at birth, and affect both sexes, but it wouldn't affect gameplay, since it is a pigment mutation.

This could even be made into markings, like Vitiligo.
However, unlike Vitiligo, it would appear as large circles, or irregularly shaped circles, instead of the spotting, like Vitilito appears as.