If relating to a blank slate is insulting to you, you ain't got your priorities straight.
Jokes aside, I do feel yall are missing the point of blank slate characters. Blank slates allow great variability in gameplay since most case scenarios can be reasonably expected without too much mental gymnastics. That's about it.
Blank slates are just prisms, you get to pick the specific color that comes out of it.
Why would it matter to you to play a loser or not? After all, you said yourself you don't relate nor self-insert as MCs. A story recounted from the side of the loser can be interesting. Loser != boring, it just means you ain't won.
Again, why would it matter to you if Axel is 'too set in his psycho-boyfriend theme'? The story would be just told from his POV. It certainly wouldn't be boring, would it? If you don't need to relate to a MC to play the game you should, in theory, enjoy playing as Axel in all of his psycho-boyfriend glory.
Again, why would it matter to have Axel as MC? You already get scenes with him as an NPC, if you don't relate nor self-insert then you could just have more scenes in-game with NPC Axel and it'd be just as enjoyable wouldn't it?
You could make an MC out your school janitor if that's the standard you set.

Case in point, why ain't nobody made no game about your school janitor yet?