Crossover: Stark the Third

Fifteen-year-old Lesmi still can't control his magic or his Omega-level mutant abilities. And after yet another inexplicable transmigration, he even gets hit on the head by a golden gauntlet. ...Hey! That man in the red-and-gold armor looks a lot like his long-dead dad! Lesmi: Sir! Are you my uncle? Tony: ??? Kid! Put down that gauntlet! Artorius Howard Lesmi Stark, the youngest child in the Stark family, has a sister, Morgan, who is five years older, and an AI named Guinevere, who was created less than a month ago. He grows up surrounded by stories about his father, Tony Stark. At eight, he is recruited into Chaldea. At eleven, he enters Hogwarts. At twelve, he starts frequently falling into other worlds. Lesmi: Why haven't I destroyed the world yet? ...Do you know how much effort I've put into not destroying the world? No! You don't! All you know is that I've been barely surviving among a bunch of gods! He tries to revive Stark Industries' weapons division: Morgan beats him up. He tries to study Chaldeas: The Doctor drags him back. He tries to combine magic with Muggle science and technology: The Ministry of Magic sends him a lawyer's letter. He tries to... Everyone: No! You don't! Why is his given name Artorius, yet he calls himself Lesmi, and everyone else does too? Look at all those King Arthurs across the mountains. It would be awkward to have the same name. The male protagonist is the son of Tony Stark and Pepper Potts.