That person is Louise. let me explain. (spoilers obviously)
This anime was a lot of fun to watch as far as the plot goes. good believable characters staying true to their character when events unfolded. You have saito, a badass mc with a dynamic harem who is actually decisive for once and can see why ladies fall for him...is what I would have said if he was actually the mc. No the mc is louise because she summons saito as her familiar and has the same problems like your typical harem protagonist. She is weak, indecisive, undeserving, and most of all stupid. Sure saito gets the spotlight but the bottom line is he exists for louise. The fact he can and did die while louise has that mc plot armor to save her ass after making stupid decisions time and time again kind of seals the mc deal to me.
Now before I get into why I just hate louise and how she ruins the entire series for me, I need to explain why I don't blame saito for some of the stupid things he does nor any of the other girls in his fake but rather dynamic harem. Let's start with Saito.
Here is a guy who has been summoned into a completely different world to serve as some girl's slave. He took it pretty well and even lives up to the title as familiar. He even dies for this girl and her world while at the same time, even washes the girl's dirty pantsus. Don't get me wrong, dude has flaws and does things he shouldn't that hurts louise but at the same time, I understand why he does such things. Louise is no doubt, abusive towards him and constantly rewards his attempts to please her by overreacting explosions. By the 3rd season, she starts kicking the balls which is never ok towards the guy you love and plain to have children with. The girls who were throwing themselves at saito were serious threats to their relationship by rewarding him when Louise should have been the one to do so.
Now to discuss why I don't hate any of the women throwing themselves at saito. The nature of saito's harem is very dynamic and just doesn't happen for no reason. It happens over time with each female having believable reasons why they want to pursue him when they know he is serious about louise. Hell two of the ladies fell off the harem wagon due to other interests/wanting to support another member of saito's harem. I have read many reviews/opinions/polls angry at these ladies for trying to get with saito
but if one saw from the ladies point of view, it makes perfect sense for why they would go after saito which is they all, at some level, think saito can do better.
Queen Henrietta goes for him because louise doesn't treasure saito who could die at any moment like her childhood love did. Saito literally dies fighting against 70,000 dudes just to make sure they all escape and next week louise is casting explosion on saito as soon as he comes back alive to go home to her.
Then there is Siesta the maid(best girl seriously) who knows she has to be aggressive if she wants to win saito. In a world where nobles treat her like shit, Saito is a shinning star in her world. He is a man that did not care what nobles thought of him and treated commoners kindly. Just about every commoner treat him like he is their champion for his actions and it doesn't help he has earned himself a title that puts him in the same, if not, higher standing to nobles. To her, she constantly sees a good man being treated horribly by a noble and wants to free him like he saved her from a bad noble as well.
Tiffa is a shy sheltered elf girl that happens to cast phoenix down on saito. She didn't go for saito at first and the relationship between them was purely an innocent one. well more on her side than his but still. It wasn't till saito kept making an impression on her and helping her meet new people that feelings started to develop. For a girl who didn't have her own familiar yet, she was envious that louise got such a great familiar only for her to treat him badly in her eyes. All she ever saw was louise casting explosion/kicking saito in the nuts. It's no wonder she wanted to go for saito too.
Finally there is Tabathia/Charlotte who joined the harem wagon during the events in season 3 because of saito not only forgiving her, but also going to personally save her from her uncle. It may seem to make no sense for her to fall for saito but for me, it's all too clear and it leads to the final problem I have with louise. Tabathia knows she can be a far more capable partner for saito than louise ever was. Throughout the entire series, Saito pretty much did all of the work while louise constantly kept getting them into danger, Like running off into deep dark woods by herself, going to places where she is clearly the target, trying to beat people with her shit skills only for her to get captured making saito's job as a familiar way harder. During the time saito was training his knights, know what louise was doing? being pissed she doesn't get to spend time with saito instead of, you know, train to develop her new void mage powers. like 90% of plot could have been solved if she would have just trained. Know why when Tabathia saves them, she actually does it? it's because she read some books and practicing her magic like lousie should have been doing. So in Tabathia's mind, louise doesn't deserve a familiar like saito and because she works hard, believes she can protect saito better because she has been doing it since season 1.
That is why I give this anime a 6 because if louise would have just tried to be a better mage, tried to be less abusive, tried to realize that even though some fault lies with saito for not resisting these women harder, that he shouldn't be treated like that due to the women in question making moves on him, I would have enjoyed the series more. At least their relationship does mature a little in the 4th season but honestly, the story felt like, in the end, saito was going to get stolen and with very good reason.
anyway I do say it's not a bad anime at the end of it all and one should give it a chance.
