is this a question? I've always thought of an action game ala DMC, GoW, where someone/something (think Dimentio FE) kidnaps (obviously :D ) Mario's crew, Mario, Luigi, Peach, etc. basically the whole mushroom kingdom royalty/important people (except toad) and takes them to another dimention/world/universe to use as fuel for their Death Cannon, which uses ''color'' as it's power source, to destroy the fun in the universe (everything colorful, vivid, basically EA/CoD's in the form of an ideal), Bowser now stands as the ruler of the MK but w/o Mario and Crew his life has lost purpose, so he decides to enlist the only witness of the incident, Toad! and embark on an epic adventure that will lead him and his newfound ally through various worlds and it's hazards, looking for clues on his fr/enemies (mario kart!) whereabouts and a way to stop this invader for good.
Throught out these ''worlds'' he visits, he finds out that Mario and crew are not the only ones that have been kidnapped but the inhabitants of said worlds too, he finds new powers and abilities/perks throught out these worlds to make him stronger but they only work inside this dimention/universe, ultimately he rescues the guys and turns all the worlds to normal where he'll forever be worshiped as the great hero who saved them and remembered for his courage - He retunrs to mushroom kindomg with the guys and realizes that he has lost all the powers he gained in the dimention but has found the meaning of his life again and inmediatly starts ploting a new way to get princess Peach once and for all.
PS: no hate to CoD or EA, i like u guys :*