Grand Theft Auto has a lot of cows.
Donald Love: Love is a horrorcow corporate executive who shows up in III and Liberty City Stories. In III, he mostly has the player cause gang wars and kill people in order to drive down real estate prices. In Liberty City Stories, he's revealed to be a cannibal who describes people as tasting "like chicken, but more sentient." A lot of his missions in that game involve collecting bodies for him to eat, one of whom used to be his mentor.
OG Loc: OG Loc from San Andreas is a dweeby loser who is obsessed with the "gangsta" lifestyle. He's friends with the Grove Street gang members, but none of them really seem to like him all that much. In order to get "street cred," he intentionally gets himself arrested for joyriding and unpaid parking tickets. He's a shitty rapper, but nonetheless thinks he's talented. Loc's missions mostly involve CJ stealing things for him to help him advance his rap career. He gets famous after having CJ steal the rhyme book of a more successful rapper, and builds an entire "gangsta" image on lies and bullshit. Despite the tough guy image he projects, he acts like a little bitch when CJ and Madd Dogg (the rapper whose career Loc had CJ ruin) confront him.
Ryder: Another San Andreas cow, Ryder is a barely-functioning drug addict. He's incredibly stupid, first of all. In one of the game's first missions, he robs a pizza place with the brilliant "disguise" of...taking off his hat. The cashier, of course, immediately recognizes him and calls him by name. He responds with "it ain't me, fool!" According to CJ, he's been dealing drugs since he was ten years old and he got kicked out of school for attacking a teacher because she was wearing purple. He believes that he was "too intelligent" for school, though, despite the fact that he's one of the biggest exceptional individuals in the game. He was more or less a proto-Jace.
Eddie Low: Eddie Low is a "random encounter" character in IV who is one of the most extreme examples of a horrorcow in fiction. He's a serial killer with pretty much every sexual fetish known to man. He touched other kids inappropriately in elementary school, and started killing people around that time. He also sexually assaulted his grandfather as a kid. He cross-dresses with his mother's clothes and keeps her severed breasts in a box under his bed. He shows up in two random encounters. The first one has you taking him to the docks to dump what is certainly a dead body, and in the second one, he tries to kill you. Among his countless sexual perversions, he's a necrophiliac and has sex with his victims after killing them.
Lazlow: Lazlow is a DJ who appears on the in-game radio in every game starting with III. Though the games don't take place in exact chronological order, Lazlow gets more and more pathetic with each new game. He starts off fairly sane, but by IV he's a has-been and a sexual deviant who's desperately clinging to the fame he lost ages ago. He gets even worse in V, where he's stuck hosting a show with a co-host he hates (and who hates him in return) and is perfectly willing to sleep with a (possibly underage) girl who appears on a talent competition TV show that he hosts. This comes back to bite him in the ass when the girl's father gets his friend and they both gang up on him. They cut off his ponytail, tattoo a dick onto his body, and force him to dance in his underwear while they film it.
Fernando Martinez: Another radio personality who appears in multiple games. Fernando is a parody of the "Latin lover" stock character. He goes on about "passion" in an attempt to seem deep and sensual, but he's just a perverted misogynist and a registered sex offender. In III, he runs a business called "Fernando's New Beginnings," which is just a glorified pimping operation, and he confesses that he's not even a real Latino.
Catalina: Yet another cow from San Andreas. Catalina first appears as the main antagonist of III, but her lolcow/horrorcow tendencies wouldn't be revealed until San Andreas. She's completely insane and rapes CJ while using BDSM equipment. She sees herself as his girlfriend, but he has no interest in her. He plays along, however, mostly because he's afraid that she'll kill him if he doesn't. She eventually "leaves" him because he's more concerned with getting money to free his brother from jail. She starts dating Claude (the protagonist of III) but continues to taunt CJ about it. She repeatedly calls his cell phone to tease him about her relationship with Claude, even doing so while the two are having sex at one point.
Zero: Another lolcow from San Andreas. That game had a lot of characters, so at least some of them were bound to be lolcows. Zero's a socially awkward nerd who is pretty much "serious business" personified. He runs an RC shop and his missions all center around what is essentially an autistic nerd fight between him and a rival shop owner. He says he's a pacifist, but he's willing to have CJ kill people, because again, RC cars are serious business. He's a 28-year-old virgin, and he's not excused from being a lolcow even though he runs his own business, because he's not very good at that; his business is failing when you first meet him, and it's only saved because CJ buys it. He's probably one of San Andreas' most infamous characters.