Harry Potter: My Elemental Magic Subverts the World

(Alternate Universe + Character Alteration + Invincible)

Dumbledore: "Kate is a legendary genius; his magic has overturned the entire world."

Snape: "He is a super genius; his magic potions are a miracle."

Malfoy: "Harry Potter, I have tempered myself in hell; I will make you taste the thunderous hell!"

Voldemort: "His power makes me unable to breathe; his students have ruined my plans time and again."

Harry Potter: "Kate is a legendary professor; as his student, I am honored. I have defeated Voldemort time and again, hehe!"

Kate is too dangerous; he is destroying the world...