rowan
this is neat I don't know anything about cats so I never realized anyone besides Blackstar was unusual
Also, isn't it plenty likely that Firestar could be some sort of pure-breed? Since he did start off his life as a kittypet?
You'd assume so! But given his family tree (neither of his parents seem to have the genetics needed for the solid ginger/pure breed assumption?), he likely isn't a purebreed. I'd be more inclined to believe he's a cinnamon color, which is non-red but close to it (so it's not auto-tabby, though tabby is dominant over solid, so still unlikely).
ETA: Did a looking into. Both parents carry tabby (and one at least carries smoke, which Firestar also has), so it'd be borderline impossible for him to not have tabby markings. This is assuming his mother didn't have relations to another tom in the same timespan, though, and assuming his mom (and this other tom) isn't carrying solid in that same instance.