American comics started with Level 5 mutants

When Su Yao opens his eyes, it is not to the familiar hum of his bedroom but to the cold, sterile glare of a Marvel Universe experimental facility. He is a mutant now—and a captive one at that. Panic is a luxury he cannot afford, yet it grips him all the same, until the raw surge of his awakened power cuts through the fear: Mimicry. The ability to reach out and copy the abilities of any opponent or being he encounters. But this is no simple parlor trick. His first targets are beings of cosmic scale—the Sun God Orochi, the Will of the Earth itself—and Wanda Maximoff, the Scarlet Witch, wielder of the chaos magic that warps reality on a whim. With each new template, Su Yao becomes less a man and more a nexus of infinite potential, a walking contradiction of powers never meant to coexist. Yet power without mastery is a ticking bomb. Professor X senses the disturbance rippling through the psychic plane and mobilizes the X-Men, desperate to find this unknown variable before his unchecked abilities tear a hole in the fabric of existence. Magneto, drawn by the unmistakable signature of a kindred spirit, looks upon Su Yao with something between awe and bewildered recognition—could this be his own flesh and blood? Even the gods take notice: Thor hails him as a lost brother, while Loki watches with sly intrigue, his mischief giving way to genuine curiosity. Su Yao's journey is no longer about mere survival. Caught between the fear of humanity, the ambitions of mutantkind, and the tangled politics of Asgard, he must decide who he will become—and whether the cost of imitating gods is losing himself entirely.