Replace character models with entirely new ones (e.g., adding Goku or Spider-Man over existing fighters).
While discussing XCI files is common in technical circles, it is crucial to navigate this space safely: super smash bros. ultimate switch xci
Swap the massive soundtrack for custom tracks from other games or media. Replace character models with entirely new ones (e
Setting up Atmosphere on a V1 (unpatched) Switch or using a modchip on newer models. super smash bros. ultimate switch xci