You might want to reread chapter 4 of the first manga. And yes, obviously there was more to her than just being "bad" for the sake of it, but that was the entire point!
I recently have and still don't know what you're getting at. Save us both some time and point out exactly what you think makes her a villainess there, so there's no guessing involved.
Aside from a couple of auxiliary characters who didn't really matter as much, I simply had the impression that all major players, from the protagonist to his sister (both past and present life), from Angelica to the "capture targets" of the first game, all had way more depth to them than what we're currently getting. That seemingly irredeemable stalker in the current chapters was supposed to be one of the male protagonists of the second game, for crying out loud. They may get better characterizations later on, but currently, the tone of the story is quite off-putting.
While there is no denying that the best things this series had to offer ended with volume 3 of the novel, you're oversimplyfing by saying it's just "auxillary" characters. Those were all what amounted to the antagonists of their own arcs, you know. People like the mentioned count's daughter, the elven supremacists, the aristocrat leading the Principality's forces - all cookie cutter villains, pretty much one-dimensional. Pierre is just like that and not to spoil too much, has about the same amount of relevance.
Also, the ones that seemed to have more going for them most often only had it on the surface, paper thin. The black knight, for example was just a crazy old guy obsessed with taking revenge on Holfort, there was literally nothing else to his character. Unlike the princesses, who were raised in ignorance, he was old enough to know the true score between the nations (he was part of establishing it) and it's circumstances, but he never even acknowledged that and kept blood-knighting. The original "capture targets" are also one-dimensional to the point of physical pain. In fact, having to put up with this fact is part of Marie's everlasting punishment itself. The author seems to acknowledge that himself, since when they do get character development opportunities... well, let's just say it's played for laughs and ends up making them even bigger simpletons.
