I ask one question: why are there so few "grey" characters? The definition of grey characters puzzles me. An evil vole is evil, not grey. Species should have nothing to do with good or evil.
Why can't the main villian of a story be a mouse? There is no reason whatsoever. No species can be all evil or all good. I would love to see a story where the protagonist is a "vermin" seeking to avenge the deaths of their family. The killer should be of a "good" species.
It is unrealistic to show all villians as cowards. Not all evil people are weak and cowardly. This should be shown.
In short, I want evil "good" creatures, heroic "vermin", and brave villians. This would make the series more realistic, exciting, less prejudiced, and all around better.