|“||Archie could've told Weatherbee the hood was mine. But he didn't. In the Book of Reg, that makes you a top tier loyal badass. And we were talking today, and decided if you want to keep the Red Circle going, we're here for you, dude.||”|
|— Reggie to Archie and Veronica[src]|
Reginald "Reggie" Mantle was initially a recurring character on The CW's Riverdale. He has since been promoted to series regular for the third season onward. He was portrayed by Ross Butler in the first season, though Charles Melton replaced Butler in the second season.
Reggie is a sophomore at Riverdale High School and captain of the varsity football team, the Riverdale Bulldogs. He is also a drug dealer that sells "Jingle Jangle" to other students, specifically Midge Klump, and Moose Mason.
Reggie presumably grew up in Riverdale, where he lives with his mother, Melinda, and his father, the owner of the Luxury Car Jamboree, a local car dealership who has recently expanded his business, adding a bigger dealership on the Eastern Seaboard. Reggie has spent much of his teenage years doing odd jobs at the car dealership, building his athletic physique, and joyriding with some of the cars for sale.  Reggie's closest friend appears to be Moose Mason; they are almost always together.
At Cheryl's End-of-Summer pool party at Thornhill, Reggie tosses the football around with Archie, enjoying the extra time Archie got before facing the trial. Archie tells Reggie that should he be convicted for murder, Reggie needs to step up and lead the Bulldogs. Reggie snarkily replies that he's already the captain, but that's not what Archie meant; he wants Reggie to help Jughead keeping peace between Bulldogs and Serpents, and to drop off anything related to vigilantes activities, whatever color associated to the Circle. Reggie agrees, stating that that bloody chapter is over and compliments Archie on his new Serpent tattoo on his arm.
Reggie and Veronica visit Archie at the Leopold and Loeb Juvenile Detention Center. They brought him a brand new pair of blue and gold sneakers as a gift. Veronica comments that they'll be perfect for his triumphant strut out of the center when the Innocence Project gets his conviction overturned. Reggie adds that he could've worn the shoes to the Pep-rally. When Archie asks him about what's going on at school, Reggie says Coach Clayton is working the Bulldogs harder than ever. Varsity squad is going to be tough to beat this year but they're missing their star running back, that being Archie.
At Pop's, Reggie answers a phone call asking for a password before allowing Josie and Kevin into Veronica's speakeasy, which is located under the diner. Veronica explains to her friends that she hired some of the Serpents from the Whyte Wyrm to sell drinks, nonalcoholic cocktails only. Veronica then asks Josie to be her resident chanteuse. Josie accepts as she has been working nonstop to find her new sound as a solo act and is in need of a place to try it out. As for Kevin, Veronica asks him to be her emcee. He accepts only under the condition that he occasionally gets to sing. Reggie answers the phone to learn from Pop that Penny Peabody is upstairs.
A shirtless Reggie brings down a delivery into the speakeasy. When he and Veronica open the packages, they discover a large stash of Jingle Jangle inside. They then receive a call from Pop Tate that Sheriff Minetta is upstairs, leaving them to conclude that they've been set up. Reggie is tasked with disposing of the drugs while Veronica distracts Minetta upstairs. Sheriff Minetta explains that he's there for an inspection. By the time Veronica brings him down, Reggie has sufficiently disposed of the Jingle Jangle, much to Minetta's dismay. Given the failed set up, Minetta then reveals that he's collecting donations for Riverdale's under-funded sheriff department, which Veronica deduces as being nothing more than a classic shake down. Sheriff Minetta tells her that he'll be back to collect the donation after her opening event. As Minetta exits, Veronica shares with Reggie her suspicion that the drugs were sent by Penny Peabody. She and Reggie know these encounters are a result of her father trying to bait her into a confrontation.
On the opening night of La Bonne Nuit, Reggie greets Toni and Cheryl as they arrive at Pop's parking lot. He shows them downstairs, where they are met by Kevin and Veronica. Cheryl then takes to social media to post Veronica to her Instagram story.
During the evening, Reggie informs Veronica that her father is upstairs. Veronica and Reggie head topside, where they find Hiram in the diner with a portrait of Veronica that he thought would be more fitting at the speakeasy, which he is sure will be a roaring success. While he knows that Veronica doesn't want to hear it, he is in fact proud of her. Veronica is glad he came, if only to see how a legitimate business is run. So, she invites him downstairs and tells Reggie to keep an eye on him.
Standing next to Veronica, Reggie enjoys Josie singing "Anything Goes" on stage during a performance fitting the noir style of the speakeasy. 
Betty calls Josie, Kevin and Reggie into the Blue and Gold offices to inform them of the Midnight Club and their parents’ past involvement with Gryphons and Gargoyles. Josie is in disbelief and Kevin questions how his father and her mother were together even back then. Much like Josie, Reggie is also skeptical. He doesn’t believe that his father did live action role-play with as he put it "a group of lame ass nerds". Regardless of what they would like to believe, Betty needs them to subtly ask their parents about Gryphons and Gargoyles, as her suspicion is that whoever was running the game back then is also running it now. Josie, Reggie, and Kevin seem aggravated at the insinuation that one of their parents could be responsible for what happened to Ben and Dilton, but they agree nonetheless.
Josie, Kevin and Reggie meet again with Betty in the Blue and Gold to discuss their efforts to gain more information from their parents. Josie and Kevin came up with nothing as their parents denied any involvement, but announced their engagement. As bad as that was, Reggie’s dad’s reaction to Reggie’s questioning in regards to G&G was much worse, as Reggie was left with a black eye. Reggie wonders why their parents are acting so secretive about something that happened 25 years ago and what Betty is keeping from them. Before Betty can answer, Veronica enters. She tells them how Archie is caught up in some diabolical teen fight club and that she intends to break him out of juvie with all of their help.
Veronica, Betty, Kevin, Josie, and Reggie meet at La Bonne Nuit to discuss Archie's rescue plan. The slightest deviation and Archie could end up dead. They will need a distraction if they’re going to disorient the guards and save Archie. Something they can sneak into the location easily, that won’t arouse suspicion, something they’ll have to make themselves, so Josie, Kevin, and Reggie sneak into the chemistry class to make smoke grenades, masqueraded as beverages. Betty will take care of the getaway route.
Veronica and Reggie, while incognito, pull up to the fight. Their entry is blocked by security, who asks for the password. When they give the wrong password, Veronica is forced to improvise. She claims her name is "Monica Norton", suggesting a relation to Warden Norton. She and Reggie, who she states to be her fiancé, want to see blood. Whether that be of from the fighters or the guard matters little to her. So she threatens to call Warden Norton should her entry into the building be denied. The guard folds, allowing them both in.
Josie, disguised as a waitress, brings Reggie and Veronica over a dozen or so "beverages". She overheard the guards betting heavily against Archie. They say he’s going down. Reggie remarks that Archie’s opponent is huge and that Archie doesn’t seem to have much time left. So, Veronica orders the others to get in position and wait for her signal.
While getting into position, Hiram grabs Veronica by the arm, demanding answers and ordering Veronica to stop whatever she's planning, but Veronica disobeys, stomping on his foot and then signaling Josie and Reggie. The three of them proceed to throw the smoke grenades into the ring that quickly fills with smoke. When it does, Archie makes his escape.
Meanwhile, Josie and Reggie wait on the side of the road for Veronica to meet them with Archie. Before long, Veronica comes from out the woods with Archie, who can barely stand. They duck down behind the car at the sound of passing police cars, and once the coast is clear, they put Archie in the back of the car and drive off.
After they arrive at Dilton's bunker to regroup with the others, Toni patches Archie up and tells him not to make any sudden movements. Archie reveals that it was Joaquin who stabbed him though Archie thinks the Warden made him do it. He then asks where are they, to which Betty explains Dilton’s bunker. The only people who know about it are in the room and it is the safest place in Riverdale. Veronica then notices the branding on Archie’s side, courtesy of Warden Norton. Jughead, Betty, Sweet Pea, Fangs, Toni and Cheryl seem particularly intrigued by the brand. Veronica then calls for everyone’s attention. Since her father saw her, she has to do some damage control on the home front. But, someone needs to stay with Archie at all times. Betty and Jughead volunteer to take the first shift. Equally important, Veronica announces that everyone in the room is part of a pact. From this moment on, no one is to know where the bunker is. No one was involved with the breakout and no one knows where Archie is. They are all expected to take this to the grave.
In a booth at Pop’s, Kevin tells Reggie and Josie how he searched the woods for Joaquin but couldn’t find him as he had to eventually double-back to act as the decoy. They quickly stop the discussion as Pop Tate approaches with their orders. Once he leaves, they resume talking. Joaquin is out there, is Kevin’s last words on the matter. Reggie, however, can’t believe they pulled off the escape. He then looks to Josie and Kevin, asking if they’re going to play Gryphons and Gargoyles to find out what their parents and Betty won’t tell them. Over the radio, an important news bulletin is made, announcing Archie’s escape. 
Reggie is a tall, attractive, and athletically built young man, his appearance is likely due to his position on the school's football team. He has straight black hair, dark brown eyes, and olive skin. His clothing choices are typically very casual, only a T-shirt and jeans.
Reggie embodies all the usual characteristics associated with the stereotypical jock. He isn't much of an intellectual and his biggest concerns seems to be football and sex, not just for himself, but his teammates as well. Like most jocks, he's socially and physically fit; the typical "cool" teenager. However, it's shown that Reggie had enough consciousnesses to ask Archie to not keep hurting his injured arm. He also comforted Archie after his dad was shot. However, his compassion is short-lived; ironically, and a cruel sense of humor, he pranked Archie by wearing a homemade black hood, while coming to Archie's home. Reggie also has a strong hatred of the Southside Serpents, if not Southsiders in general, even going as far to frame them when they were transferred to Riverdale High.
- Main article: Archie and Reggie
|“||Archie could've told Weatherbee the hood was mine. But he didn't. In the Book of Reg, that makes you a top-tier loyal badass. And we were talking today and decided if you want to keep the Red Circle going, we're here for you, dude.||”|
|— Reggie to Archie and Veronica[src]|
The relationship between Reggie and Archie is ambivalent, and they can be described as frenemies. Being both very competitive, Reggie and Archie are often on opposite sides, especially in sports or as leaders of the Riverdale Bulldogs. Their strong personalities often clash when it comes to giving voice to their opinions. However, Reggie holds Archie's friendship in high regard, even when he would not be willing to admit it. Their bond is also solidified by their strong sense of justice and loyalty. For this reason, Reggie decided to join Archie's Red Circle group after acknowledging Archie's sense of friendship.
Reggie and Moose can easily be considered best friends. They are both very fond of sport and Riverdale Bulldogs' teammates. In addition, Reggie and Moose seem to share a passion for jokes and pranks, although sometimes they go too far and end up bullying other classmates like Jughead Jones or Dilton Doiley to the point of exasperating them. Reggie and Moose' friendship, however, can be deeper, as when Moose ended up in the hospital after being assaulted by the Black Hood and Reggie cheered Moose up when he returned to school after visiting him several times in the hospital.
|“||Isn't it always some spooky, scrawny, pathetic Internet troll, too busy writing his manifestos to get laid? Some smug, moody, serial-killer-fanboy freak. Like Jughead.||”|
|— Reggie about Jughead[src]|
The relationship between Reggie Mantle and Jughead Jones can easily be defined as a rivalry, as they have both shown a great amount of disdain for one another. This rivalry likely stems from Reggie's typical jock nature, to pick on outsiders and misfits, such as Jughead, who was subject to a lot of Reggie's bullying. Jughead and Reggie had been adversaries long before the start of the series as their dislike of one another seems well ingrained.
- Reggie: "I get you're pretty much Beyoncé, but today, you're just like us commoners."
- Josie: "I think your biceps can handle it, Mantle."
- Reggie: "You trying to get me to flex?"
- ―Reggie flirting with Josie[src]
Reggie and Josie's relationship is halfway between flirting and squabbling. Their similarly strong and contrasting personalities often lead them to tease each other almost every time they are together in the same room. Despite that, or maybe because of that, they have been making out at Nick St. Clair's party after getting high on Jingle Jangle. Moreover, Reggie and Josie joined force running for becoming student body president against other two teams formed by Archie and Veronica, and Betty and Jughead. Nevertheless, the true potential of a full-fledged relationship between the two remains to be seen.
|“||Veronica! I heard you got a face full of dairy. I've got some nuts to top off that shake if you want. [...] One question I gotta ask, as future Student Body President. What are the odds your dad's the first inmate in that prison he's building?||”|
|— Reggie harassing Veronica[src]|
The relationship between Reggie and Veronica is often poles apart. Reggie is usually making jokes about her, especially when he knows that his provocations could trigger reactions in Veronica that could ridicule her in front of others. On the other hand, Veronica has often referred to Reggie as a misogynist and scarcely tolerates his stereotypical jock personality, that she also referred to as toxic masculinity. Noteworthy is the incident when Reggie, after harassing her a bit, asked Veronica what were the odds that her father is the first inmate in the prison he was building, and Veronica grew so angry that she punched Reggie in the face and dropped him.
- Neither Reggie nor Moose Mason were cut from the football team, the way the Chuck Clayton and a number of other players were, when the scandal of Chuck's "playbook" broke, despite their names being clearly visible in the book.
- Reggie drives a 1970 Chevrolet Chevelle SS454, which license plate is: 4DC 891 as shown in "Chapter Sixteen: The Watcher in the Woods".
- As in the Archie Comics, Reggie has an ongoing rivalry with Archie Andrews.
- In the 2015 "Reggie and Me" comic series, it is explained that this rivalry is mostly due to Betty's intrusion into Reggie and Archie's friendship when they were kids.
- In the same series, Reggie has a bad-to-non-existent relationship with his parents who are too busy in their socialite life and they often leave him alone at home. In this iteration, his father is the publisher of the local newspaper, while his mother is a philanthropist.
- In 2015 "Reggie and Me", Reggie has a crush on Midge Klump and for this reason, he has an ongoing rivalry with Moose Mason, Midge's boyfriend.
- In 2017 Riverdale comic series, Reggie is in a secret relationship with Josie McCoy, started in Riverdale #5 and featured again in Riverdale #10.
- Ross Butler left the show due to time complications with his role as Zach Dempsey in "13 Reasons Why".
- See also: Category:Images of Reggie Mantle
Season 1 Screencaps
Season 2 Screencaps
Season 3 Screencaps