I just finished reading Apocalypse Meltdown and I enjoyed the personal system store (window) that is exclusive to the MC. I want something like this in a LitRPG format. I also want the MC to be super strong and bordering on OP. (not godlike just super strong)
Not everyone read that novel so I would clarify what you mean by marketplace. If you mean a physical marketplace, then how about this: Master Hunter K (Everyone has a marketplace but it is exclusive to them, MC also knows secrets in the marketplace no one else does) If you mean just access to a store window: Seoul Station’s Necromancer (Exclusive to MC only) PS Please make your reading list public.
Isekai Yururi Kikou ~Raising Children While Being an Adventurer~ these to have a marketplace exclusive to the mc.
Pretty much every novel that has a system/game element.has some sort of store available only to the MC. https://www.novelupdates.com/series/bringing-the-supermarket-to-the-apocalypse/ MC can pop into his own personal Supermarket. https://www.novelupdates.com/series/shadow-hack/ MC can buy Martial arts etc. https://www.novelupdates.com/series/my-mcv-and-doomsday/ MC can buy upgrades to his car, serums for himself etc. https://www.novelupdates.com/series/the-human-emperor/ MC can buy Cultivation related stuff.