Sirius
Exactly what Gingaddict, Reenarules, and Dragon said, but I got more to say about this.
SPOILERFrom GDWO through TLW, Sirius pretty much looked or acted like a villain throughout most of the time. But while he was fighting Orion as Akakama’s apprentice but then successfully had Akakama change and join the Ou army and reconcile with Orion as brothers in GDWO, Sirius was worse in TLW than in GDWO. In TLW, I almost convinced myself that Sirius was really going to turn into a villain. With all of his bullshit actions in TLW, no doubt that Sirius would make himself a villainous character. I mean he suddenly developed feelings for Monsoon before the first battle and then abruptly took the sickle away and nearly caused Unsai to get killed during the battle. He even showed that he didn’t care about the Ou dogs that died, including Jerome’s family. And he observed the Ou army as the real evil, especially seeing every dog who didn’t trust him and agree with his morals or beliefs as an enemy. Even if he still loved his friends and family and wanted the Ou army to make peace or get along with Monsoon, it all just looked like Sirius was dumping his friends and family for a cruelly evil black hearted asshole, even blaming every single Ou dog that fought Akakabuto, believing that Monsoon was evil because those dogs killed his dad. He blamed those dogs, including his own grandfather, that defeated Akakabuto and freed the land from his evil supremacy of terror and achieved peace for dogs and humans? How extremely foolish!
So Sirius would make a villainous character because of all those stupid bullshit actions in TLW and a lack of common sense. Hmph...that fucking idiot. Despite his pretty sad death in my honest opinion, he gets no sympathy from me until the day or time he admits/realizes all of his wrongdoings.