Badass Family: A multiracial, adopted/surrogate family, but the love and loyalty is there nevertheless.
Everyone Has Standards: Dom and the team will be the first to admit that they're not heroes or saints, but even they're horrified enough in Furious 6 by Shaw's vicious crushing of innocent civilians under his tank that they deliberately change battle formation to protect said civilians from the psychopath's rampaging tank. Letty exhibiting these same standards by criticizing Shaw while in the tank with him as a member of his crew is a quick hint that her time as a heel is soon to be over.
Bruiser with a Soft Center: His Establishing Character Moment as this comes when Brian saves him from the Police in the first film. Dom's just beaten Brian in a race and had no high opinion of him before the rescue, but afterwards he treats Brian with friendship and respect, showing just how important loyalty is to him. So yes, he is somewhat of a jerk, but stand up for him and he will die for you.
Tranquil Fury: This state is even more dangerous, as combined with his Godlike driving skills, there is literally no place you can hide from his wrath. Owen learned this the hard way.
Undying Loyalty: To his family and friends. A particularly strong example of this is shown in the the sixth film when it's revealed that Letty is alive and well, but is also working for Shaw. When Brian states that maybe the Letty they knew is gone, Dom states word-for-word, "You don't turn your back on family. Even when they do." His loyalty is rewarded when he and Letty re-unite.
Wrestler in All of Us: In Furious 6 Dom and Hobbs defeat Klaus by teaming up to deliver a version of the Doomsday Device double team finishing manuever. Earlier in the fight he also delivered a flying headbutt to Klaus.
Boxed Crook: After the first movie, Brian was, for the most part, a fugitive from the law, out of a job in the L.A.P.D., with a very keen interest in underground street racing. When the U.S. Customs Service gets a hold of him, they cut him a deal in not letting him go to prison. This carries over to the FBI, who were actively trying to hunt him down.
Character Outlives Actor: In February 2014, it was announced that Fast and Furious 7 director James Wan and writer Chris Morgan have revised the script so the footage that Walker shot before his death can be used to retire his character Brian O'Conner without killing him off.
Dark and Troubled Past: Brian had a neglectful childhood and eventually became a juvenile delinquent alongside his childhood friend, Roman Pearce. They both spent their last years as minors in a youth detention facility. He also has no memory of his father.
Disappeared Dad: Brian told Dom that he didn't remember who his father was or what he looked like, showing that there's a strong possibility that Brian is an orphan, an adopted child, or maybe even a street kid.
FBI Agent: He gets promoted to one by the fourth film.
Misblamed: In the fourth and fifth films he's blamed for screwing things up for the Torettos and their friends because he…did absolutely nothing other than call in a medivac for Vince. Really, the only thing that would have changed had Brian not been involved would have been Vince getting killed off earlier in the series. That or Dom would have been arrested when Brian saved him after the first street race.
Nerves of Steel: As an undercover cop, this is a necessity. It earns the respect of Carter Verone in 2 Fast 2 Furious, since Brian can admit to Verone's face that Monica Fuentes is gorgeous without hesitation.
Obfuscating Stupidity: He admits that he's a very good liar and his ability to slip Beneath the Mask is one of the main reasons Brian was selected to be an undercover agent with the FBI.
Officer O'Hara: He's blond-haired, blue-eyed, fair-skinned, and both his first and last names are Irish in origin.
Red Oni, Blue Oni: Compared to the rest of the cast, he's very calm and collected most of the time. Surprisingly inverted with Dom, sometimes.
Running Gag: He never manages to fairly beat Dom in any race. Until 6, that is.
Sixth Ranger Traitor: In the first film, Brian was an undercover cop while Dom, Letty, Leon, Vince, and Jesse were professional thieves.
Undercover Cop Reveal: In the first movie, he reveals himself to call for a medical helicopter to save Vince's life.
Face-Heel Turn: Appears to have made one in Fast and Furious 6. Subverted when it turns out she only joined up with Shaw because she had lost her memory and Shaw took advantage of that. She's genuinely disturbed at how little Shaw reacts when she tells him one of his men was killed, and when Shaw runs over cars with a tank, she tells him that it's not in the plan. After Dom saves her life, she re-unites with him and the team.
Undying Loyalty: To Dom. After his arrest, she contacted FBI Agent Brian O'Conner for help and became a double agent for Braga's crime ring in order to allow Dominic to return home. Looks to be averted in Fast & Furious 6 as she's shown to be The Dragon to Owen Shaw, even shooting Dom and walking away the first second she sees him in the film, then subverted as she rejoins the crew after Dom saves her life; it's foreshadowed even before then, as she shows disgust at some of Shaw's actions (barely reacting when Letty tells her one of his men was killed, running over cars in a tank for no reason), showing that even without her memory, her standards fall way more in line with Dom's code than Shaw's.
Consummate Liar: He's a "fast-talker"; or in other words, someone who can lie through anything.
Cool Plane: Seen onboard a private jet in the early scenes of 6, with the words IT'S ROMAN, BITCHES! plastered on the rudder.
Dark and Troubled Past: It's very likely that Roman had a neglectful childhood and eventually became a juvenile delinquent alongside his childhood friend, Brian O'Conner. They both spent their last years as minors in a youth detention facility.
It's implied that Rome's obsessed with money. When Brian tells him that his "pockets weren't empty", Roman then showed him the drug money and said "we ain't hungry no more either." He stole the money before he helped Brian apprehend Carter Verone.
And in Fast Five, he's very reluctant to participate in the mission, thinking it's personal and won't be any good for business. It isn't until Dom mentions that the vault's full of millions of dollars in cash that Rome's willing to change his mind.
Averted in 6 when he drops everything as soon as he hears the others need help. Of course after he hears what the group is needed for, he asks Brian "We getting paid for this right?"
Motor Mouth: Compared to the much quieter Brian, Roman never seems to shut up.
Ascended Extra: He's introduced in the second movie, mainly as a friend to Brain and a race coordinator but nothing more then that making him mostly a minor character. So it was a surprise he was picked for the team in the fifth movie where he was given more of a character.
Career-Ending Injury: He says that his permanently injured leg is the reason he can't race anymore, though he does get into more conventional chases in 6.
Drives Like Crazy: And not in a good way. He's shown to be unable to even drive a remote control toy car without getting into an accident.
Gadgeteer Genius: Tej is very good with technology, identifying and knowing how to open a very large, high-tech safe from the police department in Rio.
Mr. Fixit: He's given up racing for the most part and instead prefers to work on cars.
The Reliable One: He's an extremely reliable mechanic and friend to Brian, even offering him a place to stay and full access to his garages and cars during an FBI sting. His help allows Brian and Roman to successfully complete their undercover assignment against Miami druglord Carter Verone.
Took a Level in Badass: Goes from just being a coordinator and not being able to drive without crashing to being able to keep pace with the others in 6.
Doomed by Canon: Han is introduced in the third movie, and then killed off towards the end. Since the fourth and fifth movies take place before that, they were both able to feature Han and show what he was up to before he went to Tokyo. Han mentions going to Tokyo in both films, and it appears he finally does after the sixth film....which doesn't bode too well for Gisele, either. She too gets killed off in 6.
Oral Fixation: Due to being an ex-smoker. Doubles as a Running Gag, as he was regularly seen munching on snacks in Tokyo Drift, then in his scene with Dom in 4, and "later" on in 5. Gisele correctly deduces that he was a smoker due to his constant need to keep his hands busy, or in her words, "A two pack a day man for sure. Unfiltered."
Stealing from the Till: Revealed that he has been doing this from DK, and thus indirectly from Kamata, DK's Yakuza uncle - which leads to his fate.
Retcon: Initially his name was given as "Han Lue", but in Fast Five his name is displayed as the more Korean-sounding HanSeoul-Oh. Of course, considering his character, either name could be aliases. Another explanation is that it's the director's way of integrating Better Luck Tomorrow's Han into the Fast & the Furious universe, since Sung Kang's similarly named characters were given no indication to be the same person before Fast Five.
An elite DSS federal agent who is assigned to track down Dominic Toretto and Brian O'Connor.
A Father to His Men: He's rough around the edges but he does care for the people who work under him. So much so that he personally kills the Big Bad in the fifth movie stating it was for his team that got wiped out in an ambush.
Badass: He's played by The Rock, so this comes naturally.
Large Ham: Again, he's played by The Rock, so it's to be expected.
Made of Iron: He repeatedly makes fifty-foot leaps out of speeding vehicles without taking a single scratch in Furious 6, whereas similar falls from far shorter distances easily killed Shaw and Gisele. To be fair, though, both those characters hit solid pavement. Hobbs landed on vehicles that were matching speed.
Mercy Lead: Gives 24 hours to Dom at the end of Fast Five as thanks for helping him avenge his team.
Screw the Rules, I'm Doing What's Right: Turns on his handlers when Mia is taken hostage by Shaw. Probably helped that one of his inside team was working for Shaw and given how he really values his men...
Wrestler in All of Us: Not surprising, considering the actor. His Fast Five fight with Dom features several wrestling style slams, and features him doing the kip-up he often did during his WWE days. 6 takes it Up to Eleven though, with him and Dom actually defeating Klaus by performing the Doomsday Device tag team maneuver.
Sean Boswell (Lucas Black)
The main protagonist of Tokyo Drift and is confirmed to return in Fast & Furious 7
The Charmer: He seems to have a way with the ladies. Sort of.
Badass Driver: Almost inverted as he crashes cars in the early part of the film and can't drift to save his life until later. But he learns quick.
Military Brat: His father appears to be stationed in Japan as part of the US Navy.
Johnny Tran (Rick Yune)
The somewhat Big Bad of the first movie
Cold-Blooded Torture: Tortures a mechanic when he doesn't have the right parts for a car by nearly making him swallow motor oil.
Evil Is Petty: He and Dom have a deal to stay on each other respective sides of town. Brian accidentally drives into it while trying to get away from the cops after the street race. At first he seems reasonable enough and leaves without incident. Then a moment later two of his goons come back and shoot up the car. Forcing them to walk.
Cold-Blooded Torture: Subjects a Dirty Cop on his payroll to this by putting a rat on his stomach, then a tin pail over it and heating it with a blowtorch. According to him, when a rat is trapped and frenzied enough it'll chew through its surroundings to get out. Ouch.
Genre Savvy: He had only told one other about the airport, his assistant Monica. So he changes his plan to use a getaway boat. When the cops indeed show up at the airport, it confirms his suspicions of her being a undercover cop.
Jerkass: Though compared the the rest of the big bads of the series, he's the least worst of them - compounded by the fact Takashi doesn't take Han's death well despite the fact Han was skimming money from him.
Hero Killer: Supposedly to Letty, subverted since he didn't quite finish the job.
Near Villain Victory: He manages to catch up to Brian's car and overturn it, allowing him to recover Braga. Just as he's about to finish him off, Dom comes busting out of the tunnels and guns straight for him. Fenix tries to shoot him but Brian grabs his leg, distracting him long enough for Dom to crush him against Brian's totaled car.
Smug Snake: Taunts Dom about killing Letty, and instead of killing Brian outright at the end, kicks him around a few times before pointing his gun at him.
Arturo Braga (John Ortiz)
The head of the drug running operation, later revealed to have been working under Owen.
Smug Snake: In the climax in the fourth movie, he constantly keeps mocking Brian as Dom and he are trying to outrun Braga's men, so much so Brian finally gets fed up and punches him to shut him up. And again In the sixth movie, since he has muscle by his side, he thinks he can take Brian while he's in prison. Brian easily handles them and get the information needed out of him.
Hernan Reyes (Joaquim de Almeida)
Main threat of Fast Five
Boom, Headshot: How Hobbs kills him in revenge for the men lost in the ambush by Hernan's men
The Cartel: Drug lord, not surprising considering the movie is set in Rio.
Dirty Cop: Not Reyes himself, but it appears he has most of the Rio police force on his payroll.
You Have Failed Me: When he hears that Dom's team raided one of his hideouts, he kills the man who reported it to him via a vase.
Zizi (Michael Irby)
Hernan's right hand man.
Made of Iron: Survived a car crash and was about to kill Dom until Brian shoots him first.
Owen Shaw (Luke Evans)
An ex-SAS soldier who is the Big Bad of Furious 6.
Ax-Crazy: Took blood-chilling pleasure in crushing dozens of innocent civilians under his tank in his rampage across the Spanish freeway; made doubly disturbing by the fact that it wasn't even a necessary maneuver to flee from Dom's crew.
Badass: Comes naturally with being an ex-Special Air Service soldier.
Bad Boss: Sees his crew in terms of interchangeable parts.
Jerkass: And that's the nicest way to describe him.
Lack of Empathy: Cares only for himself and states to Dom that his family is his weakness since he thinks that makes Dom predictable and easy to handle. Oh how wrong he was.
Man Behind the Man: Revealed to be the one behind Arturo Braga, the drug lord from 4 which explains how Letty ended up in his employ.
Smug Snake: He's certainly not lacking in the confidence department. Though at least he can back it up.
Tempting Fate: He manages to pull off a gambit near the end of the film that got him released after he was caught. But then he has to state that Dom's team "were never part of the game". Not a few minutes after he says this, said team come bearing down on him as he's trying to make his getaway. Resulting in his team being dismantled in the ensuing fight and he himself getting ejected out of a car and out the back end of a plane onto a speeding runway.
Underestimating Badassery: You know even if you do have a backup plan to get the MacGuffin, it's probably not wise to underestimate people who can stop a tank or nearly go flying off a bridge to save a love one you yourself nearly tried to kill. And especially kidnapping and threatening the wife and sister of two of your enemies' leaders. Note that he specifically chided one of his men for deriding them as common criminals. Someone needs to listen to their own advice.
Villainous Valor: He doesn't respect Dom's love of family. He does, however, respect the fact that Dom has a code by which he lives, which is why he offers Dom a chance to leave no strings attached. Of course, he's also seems not to realize that Dom's code is exactly why he won't leave under any circumstance.