There can be animals such as Lawyer cats and other things with levels. Like a Lv. 3 Lawyer cat with more health. The health would depend on its level. It would also give you more EXP if you killed a high level opponent. :D Thank you for reading my suggestion, it would be a wonder if you implemented it into your game!
I would love monsters that can be normal but also stronger at the same time... but i think it should be rare.