

Reborn to Master the Blade: From Hero-King to Extraordinary Squire, is an excellent little light novel and manga. It is a disappointing anime, but it can't fully ruin what makes the story great. I'll be writing from that perspective.
There is a moment watching this show, somewhere around episode 5, where you will sit back and think to yourself "Hmm, something is missing. Something has gone very very wrong." And you are correct to think that way, I believe.
Part of this is the simple realities of budget, and while it looks like Reborn to Master the Blade has a bigger budget than most isekai shlock, it isn't by a lot if that's the case. So one of the things ruined is Inglis' bloodlust. Looking to the manga adaptation, Inglis is often given what can only be described as "Crazy eyes" and some very expressive, threatening faces throughout the series (the manga only reaches about Episode 7 of the anime at time of writing). Inglis doesn't just find joy in battle she finds lust and her righteousness (briefly) warps into a kind of sadism. I've seen some people argue Inglis is a genderbent Goku, and that comparison isn't entirely unfair when only looking at the anime. But animating a different face would cost money, so I can at least understand why that might be cut.
But the true problems are the "Marvelization of Isekai", where story and character beats are dropped or outright reversed in order to make Inglis a more generic, blander, "safer" isekai protagonist. This is the Disneyfication of media on full blast, rearing its ugly head in the big moneymaker genre of contemporary anime. These are deliberate decisions that make the main character a more bland and boring power fantasy, rather than distinguishing her as her own person. For example; early in the series Inglis subjects herself to the Dune-box for her rune, and while she doesn't receive one in the source material, that is because her magic is incompatible with the modern magic around her, an oil-and-water sort of reaction but mana. In the anime, Inglis just chooses not to get a rune. Why? Because she's just so super strong and powerful she can out-fight a BOX. I guess. And unlike the previous example, the anime stretches this scene out. That feels like it would cost more money to emphasize?
Other character motivations are dropped entirely. In the anime, Inglis is going to the big city to go to Isekai fighting school because that's what the kids do. Her motivation to do so because the city will have the largest library in the kingdom, where she hopes to find SOME record of her previous life or the kingdom she left behind? Gone completely. And the gender euphoria beats are almost completely excised from the show, whittling more of Inglis' individuality away in favor of a blander, more generic self-insert, which can probably be down to the studio sterilizing all the queer subtext that pops up from time to time. And Inglis' source traits of being more socially suave and manipulative, like twisting her dad's arm to let her fight, are brought way down, presumably to make the character less confrontational and polarizing (i.e., less self-insert).
For me, the last twist where the connections I had to the earlier Inglis snapped and tore away was in Episode 9. The last fragments of joy had really left my watching the show at all as at one point I facepalmed and groaned, "This is such man-writing." I'll admit I watched the last three episodes out of obligation.
But...I still love Inglis and I still love Rafi and even if their characters are buried deep behind layers of "lolsorandom isekai", I still liked seeing their reflections in what I was watching. So I can't say this was a completely unenjoyable experience. While the limitations of budget are showing (and hurting) it's still, on the whole, a very pretty show, and a good amount of the humor lands. But this definitely falls more on the junk-food side of your anime food pyramid.
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