Books where a character changes in terms of their actions… But the way they think doesn’t change at all.

I'm looking for a specific kind of character arc essentially. Where a POV character is awful in a number of ways and their character arc involves them subtly deciding to change…. But inside their head they're very much the same person.

So examples of this would be the character thinks rude things and says exactly what they think….As they change they still think the rude things but now they say kinder things.