It's because when they do make an appearance they're always cast as the protagonist an or amongst the protagonists. How many VG protagonists are there with any depth? You can probably count them on one hand. Antagonists, on the other hand, are almost always given Human qualities, backstories and character development. The proportional increases significantly if they're an antagonist-turned-protagonist and almost absolute if they're an antagonist-turned-protagonist-turned-antagonist. I'm not going to list examples because they're too numerous and I don't want to give this discussion tunnel vision. I also want you to search your memories and realise that I'm absolutely right about this. For double points, compare the female protagonists of a game to the female antagonists in the same game. Of course, this applies equally to male protagonists/antagonists. Something interesting to note is that some of the deepest games ever made have some of the most shallowest protagonists ever made. Usually protagonists who don't utter a single word throughout. I'm not absolutely certain why this is a thing but I'm pretty sure it has something to do with creators wanting people to like the protagonists they make which is why they don't actually give them any Human qualities or take any risks with them. @HeliosOne This is why your waifu sucks. I'm sorry but it's true. Compare her to other female characters in the series including the female protagonist in the second game (who has the same amount of depth and is also a plot device) and the female protagonist in the second game of the series that inspired the current series.