This fic is 100% just for self-indulgence and I can actually promise you it won't ever be completed, so don't read this.
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Some kids dressing up as heroes and villains (Super Craig, Wonder Tweek, Tool Shed, Human Kite, Tupperware, Mosquito, Mysterion, Professor Chaos, and The Coon) are transported to a world full of real heroes and villains. Stranger yet, all of their imaginary superpowers become real.
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South Park/BNHA Crossover. The only ships I can guarantee are Craig/Tweek and Butters/Kenny the rest is entirely just based on what the characters decide.