What I don't understand is the amount of hate readers give the kid.
I reckon it's because he's an annoying nepobaby who falls upwards and has a harem despite no personality (and also tries to flirt with the girl who already likes Akira; I know that bugged me because he already has plenty of girls he already likes fawning over him), yet he doesn't have the skills to back his arrogance up. Hits too close to home for most folks because we've all met people like that.
I think there
could be an interesting story told here, but it's just not well realized at all. Katsuya could make a good character foil for Akira - Katsuya was born into privilege, has his own AI waifu in his head, and does the same job vs Akira, who is basically just a puppet for his own AI waifu and who is from the slums... But where the writer erred is making Katsuya feel too much like a fuckup who only got where he is on connections, not because he's actually strong.
Akira had to basically sell his soul to a techno-succubus to get the power he did. Katsuya didn't.
I think if Katsuya's arrogance was at least partly well founded it wouldn't be so annoying. If his privilege actually resulted in a superlative monster hunter due to having the finest training, the best equipment, etc it'd be tolerable, but what we have here is Katsuya being delusional about his own capabilities despite how badly he fucked up very recently. He basically reads as a low key spoiled rich boy. He's not actively malicious about it the way some other characters in other works are, but it's really frustrating seeing so many characters fawn over him despite how lackluster his performance has been so far.
Especially because he had what would narratively be a huge humbling moment when someone important to him nearly died and had to be saved by his rival... And yet it's clear he hasn't learned anything. He's still the same arrogant twat he was before. He hasn't visibly thrown himself into learning how to do his damn job and becoming competent, and he's still being treated as a savior due mostly to his unearned political connections and given command authority over the lives of others on an important monster hunt after he's already fucked up once.