With Strings Attached has a lot of these: Terdan, As'taris (almost all Baravadans, actually), the Hunter (though he undergoes Character Development), and most especially Jeft. Also, the Dalns gods are Jerkass Gods, though this is only talked about, not depicted.
The Harmon Verse has a couple of these: The titular protagonist, Jack Harmon, being the biggest offender of them all.
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.
Lung from the Jackie Chan Adventures fic Queen Of All Oni, comes across as this, crossing the Moral Event Horizon in his first real appearance by kidnapping Jade and nearly KILLING her with Cold-Blooded Torture in an attempt to break her to his will! (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). One reviewer even PRAISED him being Killed Off for Real by Right.
