What if, in TPB, Rusty/Fireheart is the villain instead of Tigerclaw? He'd still be the main character, and instead of it being the generic good/evil dynamic, Tigerclaw will be something like lawful neutral and Fireheart chaotic good/neutral/evil, and their personalities different either naturally or if their past was altered (e.g. if Pinestar didn't leave ThunderClan)
A lot of would and would not also happen in the story due to the circumstances of this AU, like Fireheart and Graystripe being friends, or Ravenpaw running away, idk it's a work in progress a lot of my AU ideas are just vague trash that I want to write but I don't know how to write it.