In Zahn's books, Thrawn has a bridge officer straight up decapitated on the spot for a failure to adapt to unorthodox tactics. He was still brutal and cold blooded, he was just calm and polite about it. The only difference between how Zahn treats him vs Zahn is that Zahn is a little too enamoured with his creation and winds up making him a little too Gary Stu-ish. Filloni always remembered that he's supposed to be a villain.
He's not an anti-hero, he's a high functioning savant sociopath.
Thanks for the info. I can’t speak to any differences, I just watch Star Wars Explained a lot and Alex is constantly talking about how Thrawn is more ruthless and evil in Rebels. I think he cited how Zahn Thrawn would never open fire on Lothal like he did in the finale.
