Here we can discuss what tropes to use if we ever decide to give this story its own trope page.

Karmic Transformation: Shadow Storm always called Spike ugly when the latter was fat. But shortly after Spike gained his powers and Shadow threatened Twilight, Spike finally had enough and punched Shadow so hard, he went flying and landed io a tank truck filled with mutagen. This resulted in him turning into a hideous blob-like mutant.

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Yeah one example down. And since it's based off I got a cheat skill, that page has some examples we could use