In Doctor Strange why is Dormammu only seen as the bigger bad while his chief henchman Kaecilius is seen as the actual main antagonist? I could understand this statement if Strange defeated Kaecilius in Hong Kong preventing Dormammu's arrival all together but no for lack of a better term Dormammu was "the final boss". Yes I know it wasn't as much a fight as much as Strange annoying Dormammu until he agreed to leave Earth alone but still tho my point is he was both the one ordering Kaecilius around and the one Doctor Strange himself NEEDED to confront and defeat in order to officially save the day so my question is: is all that not enough to make him the main antagonist because if not then why not and before any of you who happen to be reading this say something like "it's because he didn't have much screen time" keep in mind there exist main villains who are simply built up throughout the course of the plot who don't actually appear until the hero(es) face them during the climax. Such examples Gozer from Ghostbusters and Smithy from Super Mario RPG and the way I see it Dormammu is one of them. 

This is the Antagonists Wiki NOT the Villains Wiki and being an antagonist doesn't automatically make you a villain/being a villain doesn't automatically make you an antagonist is that right? From my understanding the protagonist is the most central character of the narrative while the antagonist is the obstacle towards the goal(s) of the protagonist am I wrong? Yet there are characters such as Light Yagami and Invader Zim who while are villains are protagonists not antagonists so my question is why are they here? 

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Does this page only focus on Disney and Marvel antagonists? Then shouldn't it better be called Marvel Antagonists or Disney Antagonists?

I think so because there are only two categories, the background shows Disney villains and there is no mention of any antagonist in other media/creation.