The more that I play otome games (or even games originally marketed as otome, even though they dropped it for whatever reason), which often feel more like cash grabs than actual stories, the more I want to fix them.
The entire opening sets of chapters to Tokyo Debunker are nonsense, and they don't even give the sense that the main character has a reason for being there beyond being a self-insert (who doesn't seem to do anything that a player would want, so I don't know how they're a self-insert). I'd rewrite all of that, and I'd also go through and fix more of the chapters to at least create relationships (of all sorts) between the main characters and all of the others.
Mr Love Queen's Choice is just hilariously terrible and really seems like a game that got entirely confused about what it wanted to do or be. The characters (other than, as always, the self-insert main character) are all usable, though. However, and it's because I get tired of the whole “must love cops” and “must love people with money,” I'd actually change them to interact with the world around them and change with it. Granted, I might also shift them to lower positions.
This is a similar problem that, hilariously, Love&Deepsace has. And it's probably because they're effectively running the same kind of story and both involve 'evol' and 'evolvers'. Again, L&D's main character is absolutely obnoxious. I don't understand why people want these hyper-intelligent people who know everything but are somehow entirely oblivious to literally everything, especially as it doesn't even work well in a character. (This isn't to say a person who is smart and talented can't be oblivious, but it's... in the extreme in these games. Your self-insert character is capable of everything! But they don't know anything! Which doesn't make sense.)
The Obey Me! series (both games) definitely had this problem, but it was often a bit more forgivable because the characters were more endearing and kind of made up for the boring main character. All of the Ikemen games've also got this problem, too. Again, the other characters make up for the main character in a lot of ways, but the main character is overwhelmingly like a boring paper doll that's only been given a handful of outfits; they don't have different personalities for different people (or rather, different mannerisms when around different people), and they respond to problems in identical ways even when it doesn't make sense.
There are only a handful of games that have managed a quasi-self-insert well. One of them is Tears of Themis. I think this is because they treat her more as a character in her own right, but the player gets to give her a name. Her obliviousness at least matches her own confusion about situations rather than her wandering through the story being well-informed and capable but entirely confused about everything. (Though, I don't remember if this is how the early story started. The later stories and events have at least made an effort to make her a person who engages with the world around her.)
Lovebrush Chronicles actually managed this well, too. But again, it's because they made the main character a person in her own right, but the player can name her. Sometimes she's obnoxious, but the ways in which she is obnoxious fit her characterisation and aren't out of place. It's easier to overlook those things (or not overlook but not be angry at them) because they fit in, and the story acknowledges this.
And while it's not at all an otome game (in the traditional sense but does the same things), the absolute best game for having understood how to make endearing love interests but also have engaging storytelling? Is somehow NU: Carnival (regardless of version you play, since there is a censored version called “Bliss”). For something so smutty, it's absolutely amazing how they can manage to stick in some heartfelt storytelling and make it feel fluid. The other thing is that they figured out that self-inserts were tedious and actually harder for the player to engage with, so Eiden (a named protagonist) is part of the story, has a character, and engages with the different people in different ways because they've realised that he needs to. He's not drastically different with one character than another, but he's shown to be adaptable to their personalities (and that they're also adaptable to each other).
And that last thing is wild to me. It's great! But it's so funny to me that the game with actual outright sex and graphic depictions (not just euphemistic storytelling) also figured out how to make it fit with the kinds of 'chaste' storytelling that a lot of these other otome games just can't handle. (Also, I hate how the Ikemen games bill themselves as “spicy,” but they still... use excessive euphemism and often get close to being spicy and then run away from it. “I won't touch you” isn't spicy, especially when it's followed up with literally no engagement between the two lovers. That's just one-way denial and nothing more.)