And Darth Vader is clearly presented as the minion of the emperor, that doesn’t make the emperor the focal point of the antagonistic side, Darth Vader clearly is.I mean, Ghirahim is clearly presented as the minion of a larger villain, and I wouldn't count the Imprisoned as an appearance by Demise. Demise only appears in what is literally the very last section of the game, but we're still expected to think he's a good villain.
And a character doesn’t need to constantly be in your face to be a good villain. Throughout the entirety of OoT you can clearly see the effects of things Ganondorf has done, overthrowing talon, enslaving the Gorons, freezing Zora’s domain, brainwashing Nabooru, Etc. Just because he’s not physically there doesn’t mean he’s not a key player in the story.
While the Imprisoned isn’t exactly the same as demise, it still serves its purpose of portraying exactly how powerful demise really is. This is why I think that demise is incredibly well written, because you know how bad things would be if he was actually resurrected. As a character he isn’t too great, but as a major piece in the story he is outstanding. Sure he’s only there at the very end, but he didn’t need to be anywhere else.
TP Ganondorf I have no excuse for though. What an absolute horsecrap excuse for a character.