!!Jethro "Jet" Bradley
Son of Alan Bradley and Lora Baines-Bradley, digitized unwillingly by [=Ma3a=] to stop the infection of ENCOM.

* ActionSurvivor: He's not as gifted as the Flynns when it comes to an IndyPloy, but makes up for it by figuring out how to use the weaponry.
* AGodIAmNot: He's quick to tell Mercury that, if anyone's crude and unworthy of peaceful co-existence, it's the humans - not the Programs. Played up a lot more in the spin-off comic; once Jet realized what being a "User" ''means'' in the context of that universe, it sent him to HeroicBSOD. He never wanted that kind of responsibility or power.
* BrilliantButLazy: Jet got arrested for hacking into his school's mainframe because he was "just bored," got an "A" in his computer classes (with three other classes getting incompletes), and turned down a promotion in order to continue being a game designer. His father is less than thrilled.
* DecompositeCharacter: In-game, he's very much a prototype for [[Film/TronLegacy Sam Flynn]], with the playful hacking, the arrest record, and apparent apathy. In the comics, he seems more a prototype for [[WesternAnimation/TronUprising Beck]], being a HeroWithBadPublicity, leading an uprising inside the system, and the troubled relationship with his father-figure.
* DidNotGetTheGirl: At the end, Jet goes back to the analog world, and Mercury has to stay in her digital one.
-->'''Mercury:''' ''You're leaving, aren't you? This is no world for a User. We're too crude and rudimentary.''
-->'''Jet:''' ''If anyone's crude, it's us. We're not ready to exist here; not yet, anyway.''
* FormerTeenRebel: While he's implied to have had a stormy adolescence, complete with bad grades and an arrest record, Jet appears to have cleaned up his act by the time the story opens. While his job isn't the one his father would like him to have, he is holding down employment and paying his bills. His boss even assures Alan via email that Jet more than pulls his weight on the job, and promoted him to lead programmer.
* KidnappedByTheCall: [=Ma3a=] didn't warn him, much less ask for consent. Before he fully understands what's going on, he's digitized, has a disc shoved in his hands, and fighting for his life.
* MissingMom: In-game emails and a flashback reveal that Lora died in a lab accident. This has driven a wedge the size of Texas between Jet and Alan.
* OnlyKnownByTheirNickname: You only learn his "legal" name from an in-game email. In the spin-off comic, he insists that even the psychiatrist call him "Jet."
* PlayfulHacker: He cheerfully says that there isn't a firewall he can't take down. Again, his father (who, as you recall, programmed one of the most {{Badass}} security programs ever made) is less than thrilled.
-->'''Jet:''' ''Don't worry, Dad. There isn't a firewall I can't take down.''
-->'''Alan:''' (sarcastically) ''Yes, I almost forgot about your'' "alternative" ''set of skills.''
* RightManInTheWrongPlace: He ran down to the lab because he heard the F-Con goons kidnap his father - only to have [=Ma3a=] activate the laser.
-->'''[=Ma3a=]:''' (in response to Jet's question about why she digitized him) ''My existance was threatened by the spread of the corruption...Alan-1 was not available. [Jet] was.'''
* {{Robosexual}}: It doesn't matter to him that Mercury is software.
* ShellShockedVeteran: In the ''Ghost in the Machine'' spin-off comic, we see that the FridgeHorror of cyberspace hit Jet like a speeding truck. Not only were the Programs he killed sentient beings, but he possibly killed some digitized ''humans'' as well. Afterwards he refuses to even touch a computer, as he thinks it would be cruelly playing with the lives of Programs.
* SpinOffspring: Played a bit sideways in that Jet's the son of the other two human leads. (And in an ass-backwards way, [[TangledFamilyTree a younger brother to both Tron and Yori]])
* StrangerInAFamiliarLand: Fitting in with above. The spin-off comic almost acts as a DeconstructorFleet on the entire franchise when it isn't just gunning for MindScrew.
* WhyCouldntYouBeDifferent: In their EstablishingCharacterMoment, Jet is playing a video game when his dad calls, angry that Jet turned down a promotion that ''"[he] pulled a lot of strings"'' to try and arrange for Jet. Jet replies he's happy making games, and an exasperated Alan grumbles that ''"You sound like Flynn."'' It's implied via emails that this is not the first time Alan's tried to manage Jet's career, or disapproved of his kid's choices in life.

!!Math Assistant 3 Audio
([=Ma3a=] for short). Holder of the digitization correction algorithms.

* BenevolentAI: Despite kidnapping Jet out of desperation, she turns out to be a loyal mentor figure and ally. [[spoiler: This probably has much to do with the fact that Lora Baines-Bradley was a very kind person. It's not ''her'' fault she goes insane for a while due to bad code.]]
* BrainUploading: [[spoiler:She is in part the remains of Lora's brain patterns that where digitised right after Lora's death.]]
* {{Expy}}: Some elements of her seem to have carried over into [[VideoGame/TronEvolution Radia]], especially the shape of the headpiece.
* FaceHeelTurn: [[spoiler: Alan never did get all the glitches out of that legacy code...]]
* KillAllHumans: [[spoiler: Again, that legacy code.]]
* InterfaceWithAFamiliarFace: And familiar voice.
* LukeIAmYourFather: [[spoiler: [=Ma3a=] is all but outright stated to be what remains of Jet's mother.]]
* LivingMacGuffin: Alan stored the necessary correction algorithms for the digitizer in [=Ma3a=]. F-Con wants the codes in order to put their Datawraiths into cyberspace, while Jet (and later, Alan) just want to get home safely.
* SummonEverymanHero: She was looking for a User to fight the corruption. Jet just happened to rush into the lab at the right moment for her to turn on the laser.
* VirtualGhost: It's implied that her resemblance to Lora Baines-Bradley is more than just the "normal" doppelganger issue with Users and their Programs. An email explains that [[spoiler: When Lora was killed by the digitizing laser, part of her was left behind in the system. the grieving Alan compiled what was left of her with the Math Assitant AI to create [=Ma3a=]]].

A formidable warrior program on the Game Grid, she was written [[spoiler: by Alan]] to find Jet and help him out.

* ActionGirl: Champion of the Lightcycle arena, and well-versed in using a Rod Primitive as a crude, but nasty, melee weapon.
* AmnesiacDissonance: [[spoiler: After she's been restored from backup]] she acts in a disturbingly robotic manner, and [[AmnesiacLover doesn't recognize Jet]] other than someone she's been instructed to contact.
* BigDamnHeroes: [[spoiler: At the Datawraith Training Arena.]]
* BikerBabe: Champion of the lightcycle arena and hasn't ''any'' trouble going up against Users.
* [[DidNotGetTheGirl Did Not Get the Guy]]: See above in Jet's section.
* DivineDate: Downplayed, since she and Jet don't actually date. Remember, Programs think of human Users the way humans think of Gods.
* DualWielding: Favors the Rod Primitive, which is handled like a cross of escrima sticks and a cattle prod, over other weaponry
* GenderBlenderName: A sultry female Program named after a Greek god.
* HeroicSacrifice: [[spoiler: At the re-format wall.]]
* SamusIsAGirl: Jet was a little surprised when he realized that "Mercury" was female, despite the name.
* YouShallNotPass: At the reformat wall, she fends off a half-dozen Z-lots to buy Jet enough time to escape with [=Ma3a=] and Byte.

An upgraded version of the Bit from the movie. Byte is sent by [=Ma3a=] to assist Jet.

* DeadpanSnarker: Bits from the first film are snarky enough with just "yes" and "no". Byte has a full vocabulary available to insult Jet and anyone else in range.
* ExpositionFairy: Byte explains a lot of things about cyberspace such as movement, weapons, various groups and so on.
* [[spoiler: KilledOffForReal]]: [[spoiler:[=Ma3a=] smashes him into a wall in a fit of rage when under influence of the Tron Legacy Code.]]
* MasterOfUnlocking: He can insert himself in certain sockets to open doors Jet would otherwise not be able to open.
* MauveShirt: While not as important as Jet, Alan, Mercury or [=Ma3a=], Byte still plays a crucial role in the story, as without him, Jet would not know what to do. Then [[spoiler:he gets offed with no prior warning.]]
* RobotBuddy: He and Jet become good friends. [[spoiler:Jet isn't even given any time to grieve when Byte gets killed.]]

!!J. D. Thorne
A former Encom security director, he turned against his employers to work for the rival F-Con, and was digitized as part of their experiments. He became a living virus in the process with ambitions to rule all of {{cyberspace}}

* AGodAmI : The power of being "Master User Thorne" went right to his head
* TheCorrupter[=/=]TheCorruption: Became a living virus once he was digitized, and proceeded to corrupt other Programs.
* {{Expy}}: Abraxas in ''VideoGame/TronEvolution'' has a lot of the same corrupted traits, but a much more tragic backstory.
* DudeWheresMyRespect: When he was passed over for promotion several times, he became bitter and started looking elsewhere, which got the attention of Crown.
* DrunkWithPower[=/=]DrunkOnTheDarkSide: VERY much so. Enough in fact that he starts a ReignOfTerror with his essentially-zombified virus programs and causes huge amounts of damage in his self-proclaimed role as "Master User Thorne".
* DyingAsYourself: [[spoiler:Thorne is dying from his battle against the Kernel, but in his last moments he realizes what he has done, then helps Alan and Jet by telling them a way to infiltrate [=fCon=]'s network. Just seconds later, it's over for him.]]
* EvilOverlord: "Master User Thorne", as he calls himself, is this trope to a terrifying degree, with a horde of essentially-zombies, looking out to conquer all of CyberSpace to make it his own and convert everyone into his loyal minions.
* GoneHorriblyWrong: Digitizing someone without the safeties leads to ''horrible'' side effects
* PassedOverPromotion: Why he sides with F-Con and is stupid enough to volunteer as a digitizer guinea pig.
* RedemptionEqualsDeath: [[spoiler:He manages a final good act in telling Alan and Jet how to infiltrate [=fCon=]'s servers, then dies for real.]]
* UnwittingPawn: F-con played him like a kazoo to fork over company secrets and undermine Encom for their takeover. Then his invasion opens things up for F-con to perfect the process and send in the Datawraiths.