Kate is a writer in a newspaper firm, where she met her on/off boyfriend Adam Carr. She is also best friends with Paige, Dorothy, Lily and Shelley since they were young. Back in middle school, she was the simple yet most popular one inside her circle. Jeremy Melton asked her for a dance which she turned down politely.
- Everyone Has Standards: She's dismayed when Dorothy reveals that she lied about Jeremy and effectively ruined his life.
- Everyone Loves Blondes: Back in middle school, she was the most popular in her group and everyone loves her, including Jeremy.
- Hair of Gold, Heart of Gold: She's the kindest among her blonde friends. She was also up to the rescue when Dorothy shouted her name for help, even though they had a fight moments before the attack happened.
- Light Is Good: In the opening scene where she politely turned Jeremy down in contrast to the rest of her friends, Kate wore a white dress.
- Nice Girl: Kate was the nicest in her circle of friends. Back in middle school, she was the only one who politely turned down Jeremy and did not accuse him of attacking Dorothy, which is the reason why she's still alive.
- Red Oni, Blue Oni: Kate is the blue to Paiges red. She's the cool chick who is more reserved and calm while Paige's the hot chick who is more impulsive and outgoing.
- Sole Survivor: She was the only one who survived among her friends.
- True Blue Femininity: She wears blue at turbo dating and Dorothy's party, as well as a jeans jacket; this color associates to her kind and gentle personality.
Paige is best friends with Kate, Dorothy, Lily and Shelley since they were kids. In middle school, she was the sexy one in their group, she likes boys and boys like her. During their middle school dance, Jeremy Melton asked her for a dance which she rejected harshly.
- Acceptable Targets: In-universe, she likes to make fun of short men, as shown in her first scene after the Time Skip where she talks about one of Kate's dates who lied about his height and a neighbor who doesn't clear the peephole in a door. This is a bit hypocritical since Paige isn't that tall either.
- Alliterative Name: Paige Prescott.
- All Women Are Lustful: Subverted. Unlike what Dorothy thinks, Paige does choose men she sleeps with. She won't hesitate to reject any man that turns her off.
- Beauty Is Bad: She's sexy but not totally evil, however what she did to Jeremy was definitely cruel.
- Deadpan Snarker: Almost all her lines are sarcastic.
- Electrified Bathtub: Killed when the killer throws her into a hot tub and tosses a power drill inside, electrocuting her.
- Hell-Bent for Leather: Ms. Fanservice Paige has a liking for black leather jackets, as shown in the turbo dating scene (to contrast with the jeans jacket worn by Kate) and the scenes where the ladies speak with Detective Vaughn.
- Jerkass Has a Point: Paige doesn't like that Dorothy is allowing a man whose last name she doesn't know to live in her house. While Dorothy retorts that Paige has slept with men who she's known for less than an hour, Paige's point still stands since Dorothy's man is a Gold Digger who's only into her for her family's money.
- Lady in Red: She wears red during the middle school dance, turbo dating, and Dorothy's party. It symbolizes her sexy persona.
- Ms. Fanservice: Shes definitely the hottest and most sexual among the girls. Her Fanservice scenes prove it. It gets to the point that Lily gets annoyed with Paige for removing her coat and showing off her cleavage at Shelly's funeral."Jesus, Paige, it's a funeral."
- Red Oni, Blue Oni: Paige is the red to Kates blue. She's the hot chick who is more impulsive and outgoing while Kate is the cool one who is more reserved and calm.
Dorothy is best friends with Kate, Paige, Lily and Shelley since childhood. Back in middle school, all of her friends were popular and she was too because she is in their circle. She was the called the fat one and school bullies even call her "buffalo". Back at their middle school dance, Jeremy Melton was the only one who asked her for a dance which she agreed on. They started to make out and when the school bullies find out, Dorothy told them that Jeremy attacked her which caused him to be sent to reform school.
- Formerly Fat: She was fat during their childhood, and still still carries a lot of insecurities from that time.
- Lack of Empathy: Dorothy has little remorse for framing Jeremy Melton and ruining his life, pathetically citing how fat she was in middle school as justification.
- Laser-Guided Karma: Dorothy started this whole mess by setting up Jeremy as a fall guy when they were seen by the bullies and she lied to save face. So what does Jeremy/Adam do to her as his last victim? He puts her in his costume and shoves her at Kate, knocking them both down the stairs. When the disoriented Dorothy sits up, Jeremy/Adam guns her down and "unmasks" her, pinning all his crimes on her.
- Lonely Rich Kid: Despite having popular friends, Dorothy is rich but she is not close with her father who prefers his mistress than his daughter. Also, ever since childhood no boys want her until Campbell walked in her doorstep.
- Straw Loser: She was the least popular among her friends.
- Unwitting Instigator of Doom: Dorothy was the one who claimed that Jeremy attacked her, leading to him being beaten, stripped, and his life practically ruined. She didnt actually think that hed come back for revenge.
Lily is best friends with Kate, Paige, Dorothy and Shelley ever since they were young. In middle school, she was the fun one among them. Back in their middle school dance, she cruelly rejected Jeremy Melton when he asked her for a dance.
- Bare Your Midriff: The outfit she wore to the middle school dance shows part of her abdomen.
- Dumb Blonde: She's a blonde, airheaded party girl.
- Genki Girl: Lily is the most cheerful and energetic among the girls.
- Life of the Party: She enjoys gatherings and is usually the one who lightens up the mood in the group.
- Nice Hat: She wore a beret to the middle school dance.
- No Kill Like Overkill: Shot three times with arrows, then falls 10 stories into a dumpster.
- Quirky Curls: She definitely wears it perfectly!
- Too Dumb to Live: Who in their right mind would pick up an unmarked package just lying at their doorstep? On the other hand this is still in character since Lily's a Dumb Blonde.
Shelley is best friends with Kate, Paige, Dorothy and Lily since they were kids. Back in middle school, she was the smartest among the girls. Jeremy Melton asked her for a dance during middle school which she savagely turned down.
Adam Carr/ Jeremy Melton
A writer and Kate's on-off boyfriend who has a drinking problem.
- The Alcoholic: Adam has had a recurring drinking problem, and this has soured his relationship with Kate.
- Anti-Villain: Tragic Villain-type. If the bullies hadn't show up, Dorothy hadn't panicked and accused him of Attempted Rape, resulting in him being beaten by the Gang of Bullies and subsequently sent to a mental institution, he wouldn't have become a vengeful Serial Killer.
- Because You Were Nice to Me: Kate is the only girl who Jeremy does not kill, because she was absolutely polite to him even when she rejected him.
- Best Served Cold: He's waited 13 years to take revenge on the girls who framed him and kept him from a normal life.
- Big Bad: The central antagonist of the film.
- Combat Pragmatist: Of the Improvised Weapon type. Aside from melee weapons like knives and axes, he'll use anything and everything at his disposal from running irons to glass shards to power drills. And unlike most Slasher Movie killers he's not adverse to just shooting his quarry. Anything goes as long as his target is dead when he's through.
- Cop Killer: Detective Vaughn is his second-to-last victim.
- Functional Addict: Having a drinking problem does nothing to keep him from being good at his job. Or from being good at killing.
- Knife Nut: Carries a long kitchen knife if there are no other objects available.
- Made of Iron: In the opening scene he gets stabbed in the leg and walks it off. In the climax he gets a pool cue smashed into his head, kneed in the crotch, and a bottle smashed against his head and appears none the worse for wear by the end.
- Relationship Revolving Door: He and Kate have a rocky relationship thanks to his drinking. He's introduced showing up to Shelly's funeral with a bottle of tequila in the shotgun seat.
- Roaring Rampage of Revenge: His objective is to kill the women who framed him all those years ago.
- Took a Level in Badass: Went from a dorky loser to a cold, calculating Serial Killer.
- Walking Spoiler: Look at all the white spaces.
A tech entrepreneur and Dorothy's boyfriend.
- Gold Digger: A male example. He's a Con Man staying at Dorothy's house to get access to her money.
- In the Back: Gets killed when the killer swings an axe into his back.
- Mr. Fixit: Dorothy counts on him to do some of the maintenance around the house. He's relighting the pilot light to the water heater when he gets killed.
- Peek-a-Boo Corpse: His body is moved from the basement to a sauna where Ruthie finds it.
- White Shirt of Death: He's wearing a white bathrobe when he is killed.
Kate's neighbor who has a crush on her.
- Ambiguous Disorder: When confronted by the killer, Gary, who is trying on Kate's pantyhose, tries to bargain for his life by saying that he is "not well." We don't learn what disorder he has because he gets beaten to death immediately afterward.
- Facial Horror: The killer burns half his face with an iron.
- No-Holds-Barred Beatdown: Ends up on the wrong end of one when the killer finds him trying on Kate's pantyhose. Despite Gary's attempts to beg for his life, the killer strikes him in the face with an iron, burns his face with the iron, then beats him to death using the iron as an impromptu flail. The script called for him to be hit 11 times.
- Panty Thief: The killer goes to Kate's apartment to find Gary trying on Kate's underwear. Despite Gary's claim that it's Not What It Looks Like and that he's mentally ill (the term he uses is "not well"), what it doesn't look like is left to the imagination as the killer beats him to death with an iron. One of the deleted scenes takes this further by Kate going back to her apartment after Gary asks her out in rhyme (and she's partway through a shower after her water ran out) and finding some of her outfits missing.
- Rhymes on a Dime: Makes three or four rhymes in an attempt to ask Kate out. "You look great, Kate. How about a date, Kate? You could be my mate, Kate.... This could be our fate, Kate."
- Stalker with a Crush: He's very interested in Kate, to the point of sneaking into her apartment and trying on her underwear.
Lily's boyfriend. A visual artist.
- Aw, Look! They Really Do Love Each Other: Despite the rough last exchange between him and Lily, he is genuinely concerned with her safety, hence why he asks Kate about Lily's whereabouts after not hearing from her for a week, completely unaware that she's dead.
- Girl-on-Girl Is Hot: Seems to have this mindset. Why else did he bring his assistant for a threesome with Lily?
- I Resemble That Remark!: When Lily is disgusted by him bringing his assistant for a threesome, calling Max a "cheap hypocritical sleazeball", Max replies "Yeah but you knew that."
- Perma-Stubble: Consistently shown with a day or two of stubble to give him a more rugged look.
Detective Leon Vaughn
A detective tasked with investigating Shelly's death.
- Dies Wide Open: His eyes are wide open on his decapitated head.
- Jerkass: He sexually harasses Paige at the police station.
- Off with His Head!: The killer decapitates him offscreen and deposits his head in a pond at Dorothy's house.
- Police Are Useless: Zig-zagged. While he's not bad with his research and following up on leads (he makes sure to check in on as many people as he can on who the girls have been in contact with), he gets taken out without much of a fight by the killer.