I have 2 mutation ideas!

The first one being extra ears. According to google, cats can sometimes be born with four ears instead of 2. This makes them look more cute in my opinion, but with lions, it could be seen as a non lethal mutation. The extra ears would be smaller, and in front of the main ears. Considering they aren't fully formed, the lion can't actually hear out of the mini ears, which renders them useless. This mutation would also be more likely in male lions.

My second mutation idea is syndactylism. This mutation causes a fusion of the toes. This non lethal mutation would cause the affected lion to have limited success in hunting/patrolling, and also(if male) cannot be kinged due to inability to fight properly.
Not all toes are fused together, it would be like two or three of them instead.
If you have any ideas about either of these, feel free to reply.
Unfortunately, if you support one but not the other, well, there's only one set of buttons. Sorry about that.