OFCOURSE MADARA..............
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I'd normally agree with this, if it weren't for the fact that Madara actually showed up himself, essentially taking over for Obito as the main leading figure of the war to continually push his plan. If Madara had remained a shadowy figure all throughout, I'd agree that Obito is the main antagonist, but the fact remains that he actually showed up himself and his character is even fully explored to solidify his presence. Not to mention, Madara's influence is ultimately what led Obito to do the things he did. Despite being more prominently shown in the series, Obito is treated almost as a second-in-command to Madara. This is very evident in the way they interact each other. Sure Obito is doing this based on his own reasons, but it ultimately makes him an enforcer of Madara's plans and not necessarily based on his own separate one. Heck he even pretended to be "Madara" on behalf of Madara, so Madara's presence and influence is definitely felt throughout the series even before his actual in-person appearance. While I agree that Madara can technically be considered as the main antagonist of the series, I think that Obito's role as a major antagonist should still be noted (just like with Orochimaru and Nagato)
