Aye i've seen slime anime. But that still does kinda have the problem that his subordinates dickride him a bit too hard lol. But still I would agree that Rimuru is 100% a more compelling, likeable and relatable character than Ains. Even when he does fucked up shit you can see the actions coming from who he is and his principles. With Ainz it just kinda feels like he's just doing what he thinks is expected of him. I could understand that a bit at the start. But as the anime went on I kept waiting for this to come into question. Or for Ainz's character to develop .. It never ever did.
And yeah it's ofc fine if he stays evil mate

I just wanted to give an example of how the characters intent matters a lot. Even if the actions are the same. I guess I just want him to actually BE a badass sometimes instead of just trying to make sure he appears infallible to demiurge or whatever.
With Ainz it just kinda feels like he's just doing what he thinks is expected of him
So like how Rimuru does certain stuff, like being a leader of a Nation, which he didn't want, but was thrown on him, and he couldn't say no, because of his backstory of being also somewhat a corporate Japaneses worker, and being generally a nice guy. The biggest difference would be starting values and morals.
And the overall stories have different genre/premises to an extent.
It would have been so much more interesting if he'd taken his new lease on life as a permission to rebel against that
Sadly, there isn't really a catalyst in the OG story for that, unlike in the Alternative Story with Keno. But one could write an alternative where another NPC or Player exist that is that catalyst for that change.
Or for Ainz's character to develop
He does have character development just in the negative, as he falls further and further and starts to believe more and more his lie of him being the
OVERLORD, which is the name and somewhat the premise. Him becoming the mask he wears. Him losing himself, about performative evil becoming real evil. Becoming the
Overlord he at the start plays as.
Not to say that alternatives, AU's aren't interesting. They can be, a reason why I love the alternate stories with Keno Fasris Invern. And some of the many fan fictions. But what I don't get is to deny others not wishing for the same changes in the story as one self, and then also claim that if someone says that they are lying. Everyone is entitled to their own opinions, I can say I find both, the canon story and the Alternative of you interesting.
And I can still enjoy both, while still pointing out why the other would require more change to characters and premise of the story.
As for the conflict of needing to persuade the NPC's of Momonga values, there would need to be a fundamental change in how the NPC's work. As how the system works in the Story, there would't really be all that much conflict, as they see him as a Supreme being, and will do everything in their power to follow his commands. (Conflict could arise via misunderstanding if Momonga can't communicate it correctly right away.) (Also would it be correct to still call the story Overlord with all these changes

)
Again, the Alternative Story you suggest could be very interesting if done right, but that would change the premise quite a bit. And because of all the possibilities of the choices and changes in the story, it would be quite hard to fully incorporate into a game. So I think that premise would fit more in a Fanfiction.
That's a decision the writer made. And it was a bad one. I'm allowed to criticize it. It's not real life. He could have wrote it out easily too maybe making it break due to a particularly traumatic event such as the loss of a pleides.
Pretty sure people would have gone for his head if he had killed the pleides off.
And if you're telling me that angle wouldn't have been more interesting than what actually happened I won't believe you
That's a decision the writer made. And it was a bad one.
And it more and more just looks like you didn't want to have Overlord but a different Story, which just so happen to have the same character names and setting. Which again is fine to have, but claiming that these things would 100% make it better (for everyone) while demanding fundamentally rewrite of the entire narrative.
But what I ultimately want to say with all this, is that maybe a Parody Porn game isn't exactly the right game to put it on top of the OG story. (As that could lead to huge choice branches and with that could more than double the work required, on the lowest end.[Disclaimer: if the choices are being done to have meaning full changes])
TLDR: I agree with you that it could be interesting, but that would not be Overlord anymore but a very different Alternative Universe. Which isn't exactly the scope of this game, I imagine. (Albeit it being also an AU, just one that tires to still be somewhat Overlord)
Cheers. Have a wonderful day ヾ( ̄▽ ̄) Bye~Bye~. (Why does this emoticon remind me of Rimuru lol.)
[I am not great with words o((>ω< ))o. Or explaining stuff. But to clerify one thing with being (or not being) overlord I mean the overall premise, better said the premise I see in it.]