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Ron the Death Eater is when a character is either Flanderized into a Jerk Ass or more into more of a Jerk Ass than they were in canon.
has a lot of these: Terdan, As'taris (almost all Baravadans, actually), the Hunter With Strings Attached (though he undergoes , and most especially Jeft. Also, the Dalns gods are Character Development) Jerkass Gods, though this is only talked about, not depicted.
has a couple of these: The titular protagonist, Jack Harmon, being the biggest offender of them all.
The Harmon Verse : Although Calvin Calvin and Hobbes: The Series Took a Level in Kindness, he still fits this trope.
In The Tainted Grimoire, everyone in Acidwire is this.
In the Katawa Shoujo fic Lilly Epilogue: Family Matters, Lilly's father is this, even apart from the canonical Parental Abandonment inflicted on Lilly and Akira for six years. He is incredibly condescending to Hisao and Hanako, referring to them impersonally and making fun of their disabilities. In Hanako's case, he mocks her timidity and asks if she got her burn scars from catching the oven on fire; considering he was warned in advance and the real reason she got them, this is a borderline Moral Event Horizon. He does apologize to Lilly and accept Hisao in the end, though.
Ronan in Naruto Veangance Revelaitons, in so many ways. He's typically quite arrogant, even towards those he doesn't hold in contempt, and frequently insults his girlfriends and other friends. He also enjoys Disproportionate Retribution, and will kill people who try to stop him from stealing things. The author tried to make Edfred this, but it failed; he's quite popular for standing up to Ronan.
In ... Adler- a selfish, arrogant... well, Project Ignition Jerkass. He'd be an outright villain if it weren't for his childhood friend, Selene (well, that and it's kind of hard to be a human villain when there's BETA around).
Lung from the Jackie Chan Adventures fic , comes across as this, crossing the Queen Of All Oni Moral Event Horizon in his first real appearance by kidnapping Jade and nearly KILLING her with (In fact, his backstory reveals that when he was a child, he hid rocks and sticks around the neighborhood to beat the other kids up with). Cold-Blooded Torture in an attempt to break her to his will! One reviewer even PRAISED him being .
Killed Off for Real by Right