while handicapped people make handicapped faces.
I'm an asshole!"
A Jerkass is a character who is so completely obnoxious that it is unbelievable anyone would willingly interact with them. They may have fans, but in most cases the appeal of their character is that they are walking schadenfreude — you know it'll eventually end badly for them, and you can't wait to see it.
Characters can be Jerkasses in many ways — some may be polite, intelligent, charming, handsome and/or brave, but still give off a basic air of snobby, sneering, self-centered prickery that makes them such a nasty little punk that you wonder why nobody's beat the fuck out of them, shanked them or busted a cap in their skull yet. Others are more obvious assholes who may be crass, sleazy, or otherwise repulsive. Either way, it's usually their status on the team of "good guy" that results in them never being called out on it. After all, if they were an asshole on team "bad guy", they'd just be another villain. This is especially disconcerting in any series following a team that needs to be coordinated and would realistically not put up with this kind of behavior. This can also happen with a hardass or grouchy character who becomes an obstacle to others rather than providing pragmatic, but perhaps unpopular, advice.
What makes them entertaining is the fact that you don't have to deal with them yourself in real life. Usually, the Rule of Funny enables the people around the person to be able to live under the same roof as them without, y'know, throwing them out, kicking their ass, or blowing their brains out. Sometimes, the Jerkass is the Plucky Comic Relief who's stepped off the beam and become The Scrappy, in which case the Rule of Funny fades away; they may be okay in the other characters' eyes, but the audience would still love to punch them in the face. Because of this, it's hard to feel sorry for them when something bad does happen to them, and it is often seen as comeuppance which will be applauded by the audience.
The single factor that pushes a merely annoying character over the line into full-time Jerkass status is their absolute obliviousness to other people's perceptions of them. Nothing they do ever strikes them as out of proportion; they never realize that anything they are doing might ever be considered inappropriate, excessive, or cruel; in fact, they believe they are actually right and everyone around them is in the wrong. If anyone ever does call them out on their Jerkassery, expect them to just rationalize it or shrug the accusation off. If the writers don't put it in check and just keep trying to one-up the character's assholishness, it can deteriorate into The Sociopath. Often the result of Flanderization or Madden Into Misanthropy.
If absolutely everyone acts like this, you're looking at a World of Jerkass.
On the off chance that something happens to nice-ify or remove the Jerkass, the other characters will be relieved at first, but will proclaim "We Want Our Jerk Back" by episode's end. If the protagonist starts as a Jerkass and learns his lesson, it may be a Jerk-to-Nice-Guy Plot.
See The Jerk Index for variations on different types of Jerks. Contrast with Innocently Insensitive, who acts like a jerk because they don't know any better, but will be quick to correct their behavior once it is pointed out to them. The inversion is Nice Guy, obviously. If you want to see the hero who is the Jerkass despite their good intentions, see Good Is Not Nice.
Not to be confused with the MTV reality stunt show Jackass. Though the cast can definitely get into this territory at points.
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