To the AUTHOR,
Hope the MC becomes ANTI-HERO with Strong sense JUSTICE, But in a balance way of the world in Grey not in Black and White.
As it is mix of comics(Earth-616) N movies(MCU).
Make his suit mix of black and grey Assassin type suit with the mix of Uru, Admantium, Vibranium with defensive runes and magic in Nano-Tech instead of Spandex.
Change Mutants into Meta-Humans.
MC- Make him a Nigh Immortal with unlimeted potential,
Master in Combat Arts(All Martial arts, Weaponary as well as Chi, etc.,), Magic , Runes , Smith/Smithery, Science( Math, Che , Phy, Bio), a brain better than super-computer all in all a master to every thing to level according to author leveling system.
Make MC save Earth from Pollution, making the Earth richer in Natural, Chi, Ki/Qi Mana and cosmiic energy and teach people of Tech-Magic(Technomancy), Chi and Many other Arts.
Also kindly Bring the Asian Characters as there are Western Characters.
Make MC better than all of them as Jack of all trades and as well a master of all so to say "Perfectum" but make all of them get powers above as it cited in Paragraph.
As it an OP comment not make it OP just make it slowly step by step for making MC more OP.
Thanks-
Reader!