It has been noted by many that, in the New 52, Batman of all people has taken a major level in kindness, while others have become bigger jerks. Bruce is actively rebuilding Gotham, trying to move on from his parents' death and even seems to be one of the nicer members of the Justice League. While some of this can be seen as the result of The Return of Bruce Wayne, where he came full circle from his previous epic Jerkass characterisation, even stories set before that happened have him as one of the nicer guys.
Precia in Game Theory. At the very least, she makes an effort to act pleasant instead of abusing Fate, so she's already miles ahead of her canon counterpart, and she does seem to get somewhat genuinely nicer as the story progresses.
In Address Unknown, Rainbow Dash grudgingly agrees to take care of a temporarily blinded Derpy, who has recently started a relationship with Twilight. While trying to get to sleep on Derpy's couch, she is forced to confront her responsibility for contributing to Derpy's lifelong misery, and makes a tearful apology the following morning. Derpy forgives her and the two agree to start over.
In the Total Drama story, Legacy, both Heather and Duncan have grown up, figuratively as well as literally, in the ten years since they were on the show. Duncan has even learned basic precepts of chivalry.
In Fate Zero Sanity, Kayneth Archibald El-Melloi starts off very similar to canon, but ultimately develops into a sympathetic character, culminating in feeling genuine sorrow when his Servant dies. His last act is to give Waver Velvet his Mystic Code and make some amends towards him. This makes his death all the more impactful.
Mr. Peabody & Sherman: In this film adaptation of the "Mr. Peabody's Improbable History" segments on Rocky and Bullwinkle, Mr. Peabody is changed from treating Sherman from being merely his pet and assistant to considering Sherman his adopted son whom he loves dearly.
In the movie itself, Penny starts as an extremely abusive bully who tries to humiliate Sherman into acting like a dog; through her experiences with Sherman in the WABAC, she grows to see him in a new light and becomes a softer and kinder person as a result.
The film Son of Godzilla is the start of showing the King Of The Monster's more loving fatherly side. Especially towards the end where he embraces his new son to keep him from freezing to death.
The whole point of the Film Thor, which is an inversion of Captain America: The First Avenger. Whereas Captain Rogers was granted power because of his kindness and decency, Thor had to learn kindness and decency first to be worthy of his power.
In Noob, Fantöm started out with an attitude about his high-level player status that bordered on Insufferable Genius. The franchise's Wham Episode enventually led him to let go of the insufferable part in the webseries and novels, while the comic is currently doing an Adaptation Expansion of the arc that led to the change.
Karkat in Homestuck becomes less of a Troll and more interested in the success of his prior antagonists. And if he's not a Jerk with a Heart of Gold, at least he's a shrewd enough leader to know when to play Team Mom for the other trolls.
John, too. As he becomes more of an All-Loving Hero — especially when contrasted with the other kids' Character Development, which often took them in darker directions — it can be hard to remember that this is the same guy that who, in his first pesterlog, responded to Dave's gleeful discovery of a bottle of apple juice by joking that it might actually be full of pee.
EB: all im saying is don't you think monster howie mandel has the power to do something as simple as reseal a bottle?