Warrior Cats: Duistere rivier (De macht van drie (2))

The characters feel so real and distinct, even without humans in the story. I wonder what inspired the way the cats' personalities were developed?

I found myself rooting for them during their challenges, but also feeling sad at times. What moments resonated most with other readers?

The setting feels rich and immersive. I'm curious whether the author drew inspiration from real forests or created a completely fantastical world.