I... honestly can't think of many stories either.
Ignoring just a reheating of past classic stories.
Either one where Zero is a plant to control the mutants, thus his powers to nulify mutant powers and addict mutant girls (they could have been given to him artificially),
or Zero is being made into a way to increase mutant population, as mentioned here before as a joke.
Either way it could be added to what happened in the comics some time ago, where first after House of M Wanda basically removed the powers of about 90% of all mutants, and then there was that whole story with all mutants moving to Krakoa and producing supermedicines, and becoming basically immortals through cloning of new bodies and mental backups. Thanks to a woman that was revealed to stop aging and going back in time when she dies and this was her... fifth time I think?
I did not read it, but I do remember things like Kitty being weird due to not being able to use the gates and having problems with the ressurrection but two things most relevant here:
Thanks to becoming a sovereign nation and the supermeds, almost everyone distrusts them, and they don't try to make allies either, and
the mental data is all saved inside Cerebro.
So my idea is that this universe is actually a simulation of where the body and mind data would be being kept, and Zero here is trying to corrupt the data to either make it all unusable or change it so they all, or the girls at least, are all loyal to him after a certain point and ressurrection. Considering he is able to teach Rouge to control her powers, if the first he changes his mind and goes for the second anyway.
I know, this is all a very convoluted story, I did not plan it much, and even if it was a good idea I doubt Oni would go for it...
But it was an attempt?
And it would leave everything free for adding more girls later, too.
Either way, about missions.
Just random missions... are not a story. They are a minigame at best. Adding them as a way to reach Wanda is just... an extra step.
