I opened doors for little old ladies. I helped the blind to see.
I got no friends 'cause they read the papers. They can't be seen
With me, and I'm gettin' real shot down and I'm feeling mean."
When a character grows into a jerkass over time (sometimes not much of it at all). Can be due to flanderization, a FaceHeel Turn, a traumatic incident, or just another regular albeit unfortunate case of Character Development, which depends on who's writing said character(s). While a Jerkass growing into a Jerk with a Heart of Gold is a common phenomenon, especially in dramas, a reversal, resulting in this trope, is also common, especially in comedies.
This can also cause tropes like What the Hell, Hero?, though whether the character changes back to their kind-hearted ways, again, it usually depends on the writer. If the transition is shown as a flashback regarding a known jerk/villain, it may be a Start of Darkness.
See also Took a Level in Badass, Took a Level in Dumbass, Cynicism Catalyst and Jumping Off the Slippery Slope. When this happens to a character temporarily for the sake of the plot, the Jerkass Ball is present. The Counter Trope to Took a Level in Kindness. Contrast Bitch in Sheep's Clothing, who was always a jerk. A character taking their level in jerkassitude was genuinely nice. When a character becomes more of a jerk in an adaptation, that's Adaptational Jerkass.
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