The antagonists aren’t really that note worthy aside that they are also taken from parts of Norse mythology as well. Not to mention that if they weren’t to do that, all that would be left is a rather irritating character. But that’s the thing, it’s so easy that it’s down right predictable from the very first episodes. It’s all done so purposeful to the point of contrivance for the purpose of having easy character development. The only thing he is noticeably good at is studying, and even then the slightest bit of pressure can make him panic and fail exams. The fact that he has to have intimate contact with the Valkyries exacerbates it. He has a somewhat scary looking physique but is mostly a wimp who is scared of human interaction. He's such a heavily flawed in so many ways that it comes off more artificial rather than believable. I'm not sure if there's a word to describe the kind of person that characters like the protagonist are. Doing actions such as kissing, groping, bathing together, or just spending time together which also usually devolves into more fan service. The way that they bond is usually for the most part risque and mostly serve as the fan service of the show. All bounded to the main male protagonist who they must form a special/romantic bond with in order to level up like some video game character, and be more capable to fight the enemy and prevent Ragnarok(I think). Although the blonde haired tsundere also facilities as being the "main girl". Valkyries being the nine girls, each on fitting into a specific archetype such as the loli, kuudere, himedere, etc etc. Val x Love is kind of a monster of the week type of show with a thin coating of Norse mythology hence the Val in the title standing for Valkyries.
Or just a culmination of all the above which this show more or less is. Perhaps it's because of it's simple portrayals of characters.There's also the paper thin plot it has until it falls into it could be the absurd and roundabout ways shows like these justify their fan service. Maybe it's the base level titillation from the abundance of fan service. There's something about these battle harems that I find really enjoyable, but it's really hard to put my finger on what precisely it is. But this is a kind of terrible that I find to be very appealing to watch at times. I don't know what anyone else could have expected from this show, of course it's terrible.