Adaptational Heroism

When a character is made more heroic or friendly in an adaptation. Opposite of Adaptational Villainy.

Anime and Manga

 * Fred Abberline in the first anime adaptation of Kuroshitsuji is possibly the most good-hearted and purely heroic character among the cast, while in the manga he seems to be developing into something more like an Anti-Hero willing to let his hands get dirty in the name of good. This is a case of Overtook the Manga. When the first anime was made, the manga had not yet given Abberline, a minor character, much in the way of a personality.
 * The same sort of process was responsible for how true character is dramatically different between the manga and the anime. In the anime he is good and kindly, but in the manga after a Reveal he becomes a major villain. In both cases he turns out to be  though.

Film

 * Bard in Peter Jackson's version of The Hobbit goes from a captain of the guard who is not important enough to be mentioned in the story before his big heroic deed of to a heroic freedom fighter whose big moment from the book was made considerably more impressively heroic and who then proceeds to even more action hero stuff not found in the book.