I think I failed to communicate my intentions in the previous question.
I was always fascinated by JoJo's Bizzare Adventure, and to an extent Araki's writing style. The main power system (Stands) of JoJo is very loose and quite a few of them (Bohemian Rhapsody, Bastet, Osiris, Atum) were obviously there for the sake of a nice/interesting idea.
They were incredibly conditional powers and always changed up the rules in ways no other stand did. Atum had to be beaten in a videogame, Bohemian Rhapsody was more of a phenomena/catastrophe than an actual power, Chariot Requiem simply switched up people's bodies to make things more confusing, and it worked.
I always aimed for something similar with Anon. Anon's overpoweredness always rubs off as a (usually impossible) change in the world around the characters and how they adapt to them. I can't hope but feel that this artificial plot has the ability to serve a certain story, that is above and beyond the plot, better.
For example: If the story focused on pirates (the Sir Francis Drake types, not the other) and sea battles, Anon would show up with a 1.2 km long, 180 meters wide, unsinkable aircraft carrier with 200 UAVs ready to go. He doesn't actually kill anyone, instead, he toys with them and creates "obstacle courses" the characters have to get through or they'll die.
More precisely it's good for poetic justice and/or giving place for interesting (and usually impossible) situations for the characters that would help develop them. But the characters are still rooted in the original plot, so I can't cut that out.
How can I abandon the original plot without making the readers feel alienated?