Profession: Providence Agent
Voice Actor: Daryl Sabara
Rex is a charming teenager with a sharp sense of humor and a thirst for adventure (at least, if you ask him). He is living the dream as the point man of a high-powered super-spy team and is amazed by the weird world he's a part of, and most definitely digs the spotlight as Providence's weapon of choice. It's like being a super-powered rock star, most of the time. Like any teen, there's a lot going on with Rex that keeps him awake at night mainly the amnesia that's robbed him of his past. He can't remember anything beyond the few months before joining Providence because they promised to help him learn where he comes from. He is driven toward any clues that might help unlock his memories or better understand and master the strange but wonderful machines banging around inside of him.
- Adaptation Dye-Job: Blonde in the original comics; black haired in the cartoon.
- Age Lift: In the original M. Rex comic, he was a blonde kid; Here, he's a Latino teenager.
- Amnesiac Dissonance: Before his most recent memory loss, he was a self-centered Jerkass thug who betrayed his best friends out of convenience. After, he's still a jerk, but is willing to risk his life for people he doesn't know all the time.
- It's pretty unquestionable that at heart he's a good person, but he's also prone to reckless and selfish behavior that can land him in trouble.
- As of episode 20, this might even be starting to drift into a subversion of Save the Villain. Though the villain in question survives, Rex does nothing to intervene, and actually leaves him with both of his robotic arms ripped off on top of a speeding truck heading for a cliff.
- He does it again in episode 35, where he trades Quarry for Circe to Breach, since Breach needs to bring back a traitor/failure to appease Van Kleiss about her own slip-up earlier that episode. Rex knew he was pretty much dooming Quarry, and did so anyways. When Quarry comes back, Rex outright wonders how he even survived the experience. Notable because there was clearly a more lawful and less violent solution that by all rights Rex would normally be required to take if he was being held accountable. In other words, Rex went out of his way to royally screw an enemy over, possibly to his death, even after said enemy had surrendered and the mission was over.
- Artistic Age: The fact that he is only 15 came as a bit of a surprise to some viewers; many assumed he was 20-ish.
- Awesomeness by Analysis: He is apparently consciously aware of the angles and trajectories his ranged weapons need to hit moving targets (Which requires knowledge of Differential Calculus level math at least, although the show only makes mention of Trigonometry).
- Batman Gambit: Rex manages to pull one of these in "Alliance", exploiting Van Kleiss' need to have him alive to turn No-Face, who wants Rex dead, against Van Kleiss.
- Done again in episode 35 He got a recording of Breach spillling way too many details to Quarry in order for her to have to trade Quarry for Circe, who she had captured.
- Brilliant, but Lazy: Turns out Rex is actually quite the math prodigy.
- Justified due to his use of geometry in using the cannon, as explained in show.
- There were actually indications early on that Rex had some knowledge of electrical engineering and that he had to design his weapons himself.
- Bunny-Ears Lawyer: He's apparently a competent espionage agent in the field, despite blatantly disregarding procedure, and outing himself at the drop of a hat. His When All You Have Is a Hammer... mentality tends to make it a somewhat viable approach, though his natural charisma is also helpful.
- Another instance: in "Alliance" he's able turn two major enemy factions against each other, create internal strife in one faction, and thwart the villains plans, seemingly all for kicks (his primary objective being something entirely separate). He does this while narrating his every action, even during stealth, and he arbitrarily quits once he gets the two factions fighting.
- Later episodes do show him being a well-behaved and competent field operative, usually when infiltrating enemy bases.
- Chick Magnet: Rex has drawn the attention of Circe, Breach, Annie, Cricket, a high ranking Green Fist eco-terrorist, Dr. Holiday's kid sister, and a random delivery girl. All of them have shown varying amounts of interest in Rex.
- Chivalrous Pervert: To an extent. He'll hit on women he barely knows, but he's more delicate around anyone he's actually interested in or respects.
- Character Development: Evident in "Alliance", where he acknowledges his attraction to Circe without it being an issue, whereas in earlier episodes it was a clear distraction. By "Hard Target", he's alright with her dating someone else (she isn't)—the bigger issue is the ensuing three's-a-crowd dynamic.
- Deadpan Snarker: Coupled with an inability to take anything seriously. Rex is constantly joking, and the more dire and serious things get, the more he dials up the snark. At times, it can get to the point where it seems to be a coping mechanism more than anything else. Which is confirmed in "Heroes United".
- Destructive Savior: Rex at one point defends his work by saying that he protects people and property, only to quickly amend that he doesn't do as much of the latter.
- Divide and Conquer: He has a great talent for getting his enemies tangled up in each other's plans.
- Dual Wielding: Averted with his builds outside of using both Smackhands at once—he'd always just rapidly switch between them. Finally lampshaded by Six in "Crash and Burn" who wondered why Rex never did this trope... Rex has no idea why, and does in the next race by using both the Slam Cannon and the BFS while on the Rex Ride. It turns out he'd just assumed he could only do one build at a time.
- Face Death with Dignity: Quite possibly the only time Rex ever drops the attitude is when he and Breach are about to be swallowed by a time portal. Once he realizes there's nothing anyone can do, he just shuts up and hugs Breach.
- Fusion Dance: with Ben Tennyson as Upgrade in Ben 10/Generator Rex: Heroes United.
- Green Lantern Ring: His powers let him create and control machinery, as well as interface with and control any electronic system by touch. It seems to be limited by his mechanical knowledge of whatever it is he's operating. He's able to power up or power down any machine easily, though anything more takes time and effort.
- Goggles Do Nothing: Averted. Whenever Rex makes a jetpack or hoverbike, the goggles come in handy.
- Good Is Not Dumb: On the surface, he's goofy, self-obsessed, clumsy, and idealistic. However, he's pragmatic when facing foes, and has a keen strategic mind. He's also accomplished enough as a mathematician to consciously apply principles of math and science in combat.
- Gratuitous Spanish: And Not Even Bothering with the Accent. Both in-universe and out, as well. He does have amnesia, after all.
- To elaborate, he's ethnically Hispanic, but born and raised around the globe. Cesar notes how he always tried to speak Spanish, with hilarious results.
- And then lampshaded by Holiday declaring that Rex needs Spanish lessons.
- Idiot Hero: Subverted. Despite his Totally Radical mannerisms and eccentric behavior, Rex, while not the smartest guy, definitely isn't dumb, and has played Batman Speed Chess with the big bad on several occasions. Also, he's a highly advanced student of mathematics, and seems have a working knowledge of his weapons' mechanics.
- Heroic BSoD: In "The Hunter" and in the end of "Assault on Abysus" and "Mind Games".
- Healing Factor: He has a slow one, taking days or weeks to heal serious injuries, putting him in a coma in the meanwhile.
- Heterosexual Life-Partners: With Noah.
- I Just Want to Be Normal: Sort of. Rex loves the action of fighting Evos, but normal life as compared to life working for Providence holds a lot of appeal for him. Basically, he'd prefer if Evo-busting was just his day job.
- In the Blood: Rex pre-amnesia had Jerkass Manipulative Bastard tendencies, to the point of sociopathically double-crossing "friends" of his. Now, consider how little Cesar seems to be inhibited by little things such as "morals"...
- Jerk with a Heart of Gold: While he can be brash and abrassive, he does have a heart.
- Laser-Guided Amnesia: A chronic ailment, evidently. Periodically, his memory gets wiped, though it's never shown to happen during the time the series takes place. Possibly a side-effect of his nanites. He breaks out of it in the finale, seemingly.
- Likes Older Women: 15-year-old Rex really likes hitting on Doc Holiday who is 28, even after he falls for a girl his own age, though it switches to semi-teasing after that.
- Made of Iron: Even without his constructs to protect him, he's inhumanly durable, being able to (for instance) withstand oceanic pressures that would crush even specifically marine-adapted EVOs.
- Manipulative Bastard: A heroic example. When he needs to be.
- Morality Pet: It's implied Rex is this for Six in "Promises, Promises", as he's the one that fought tooth and nail to get him on the team.
- Officially proven in "Divide By Six" where he said the main reason he never succeeded One was because he met Rex.
- Even after he loses his memories, Rex ends up as this to him because he trusts Six so much.
- Shoot the Dog: ... And yet, it's also flat-out stated that if Rex's Phlebotinum Overload hits Superpowered Evil Side levels, it's Six's job to kill him.
- He's told to do just that at the start of "Six Minus Six", since the machine was putting Rex in danger of turning back into that mecha again. Six chose to attack the machine instead, which gave him six years of memory loss.
- Mysterious Past: So mysterious, not even he knows the full extent of it. In fact, he knows less than several other characters.
- Nigh Invulnerable: He never actually get's a scratch on him, and internal damage is very rarely implied despite the frequently extreme blunt force trauma he normally goes through. Crush-depth pressure doesn't faze him, either.
- Person of Mass Destruction: From what is seen, it might be deconstructed with Rex. Despite being the only thing capable of curing E.V.Os and pretty powerful, the higher ups are more concerned with him doing his job rather than going rogue and Rex just wants have a bit of normality in his life instead of being caged up like some animal.
- Phlebotinum Overload: Rex's Power Nullifier ability works by absorbing their nanites. If he absorbs too many, it's not pretty.
- Power Nullifier: He can "shut down" other Evos, permanently reverting them to human form. Unfortunately for him, some Evos are incurable.
- Psychoactive Powers: If Rex loses confidence, his constructs begin to malfunction and may fall apart.
- Race Lift: In the original M. Rex comic, he was a blonde kid; Here, he's a Latino teenager.
- Real Men Wear Pink: He really likes watching telenovelas.
- Red Is Heroic: Wears a red jacket as his main outfit.
- Red Oni, Blue Oni: The red to Six and Noah's blue.
- Required Secondary Powers: Made of Iron, to be specific. He gets thrown through lots of things that a normal person really shouldn't get up from being thrown through. It's later made clear that he has Super Toughness bordering on being Nigh Invulnerable.
- Screw the Rules, I'm Doing What's Right!: He often times goes against Providence's orders to do what he believes is right.
- Shapeshifter Baggage: Justified as of "Frostbite". He cures other Evos by drawing their nanites into himself. That's where the extra mass comes from. Once he's drawn in too many to handle, Providence has facilities to remove the excess baggage. It's also been shown that creating his machines does in fact increase his weight.
- Shapeshifter Weapon: He doesn't have one so much as he is one.
- Smug Super: Rex is a mild version of this. Being a teenager with superpowers, it's not exactly surprising.
- Spider-Sense: Played for laughs, he gets shivers when Breach is nearby—it's actually very accurate.
- Swiss Army Hero: Figuratively (Rex's multiple nanite weapons) and literally (He was born in Geneva).
- Superpowered Evil Side: The flashback episode "Promises, Promises" shows that Rex, just prior to joining Providence, somehow built himself into a massive, biomechanical monster that even fighter jets couldn't take down. Doing this wiped his memory. "Assault on Abysus" shows said monster is something he imagined as a kid. In the finale, his improved powers result in an upgraded version of this giant robot form, and unlike before he's in full control and it doesn't cause him to lose his memories. On the contrary, this time he recovers all of his lost memories from prior to the start of the series.
- Super Prototype: His nanites are from the first batch created prior to the Event. The only stable batch, in fact.
- Taught by Experience: By the third season it's apparent that Rex is an asset not only because of his combat and curing abilities, but also because of his extensive knowledge of Evo habits and ability to take advantage of them.
- Technopath: His EVO powers allow him to control machines.
- 10-Minute Retirement: In "The Hunter".
- Took a Level in Badass: In an interesting twist for a western cartoon, even some of the most dangerous members of Rex's Rogues Gallery pose less and less of a threat to him as the series goes on. There are exceptions, But the Big Bad Van Kleiss isn't one of them.
- Totally Radical: Justifed, since he has no memory more than about 18 months back, a lot of what he does may just be what he thinks normal teens do - and he probably learned from television since he's always around adults. No other teen in the series acts remotely like this, either.
- Unwanted Harem: And how! He's garnered the attention of at least six girls in two seasons, though notably one is his villain's misguided Dark Chick, another is the same villain's other Dark Chick who trapped him in a creepy pocket dimension, and the most normal of the girls is a disaster magnet. Long story short, emphasis on "Harem," extra emphasis for "Unwanted."
- What You Are in the Dark: To a lesser extent, episode five. When outside Providence, he starts stopping random Evo attacks.
- You Fight Like a Cow: Rex will ALWAYS come up with a smart-ish remark, no matter the situation. In over two seasons worth of episodes, there are extremely few, possibly only one, times that he doesn't snark. It is in fact confirmed to be an act that he puts on to cope with fear.
Profession: Providence Agent
Voice Actor: Wally Kurth
A senior-level operative for Providence, Six is literally the sixth deadliest man on the planet. Highly skilled in every form of combat and trained in methods of intrigue, Six is the ultimate bodyguard to Rex. His stoic nature and lightning-fast mind have made him a prized operative and explain why he was given the assignment of helping Rex learn how to utilize his powerful abilities. Unfortunately, Six doesn't have much patience for undisciplined partners, unreliable machines and especially smart-mouth teenagers! So from the onset, Rex and Six have an abrasive "odd couple" relationship.
- Ambiguously Brown: Word of God says Six is Chinese, but the average viewer didn't really get that impression.
- Amnesiac Dissonance: Six of six years ago is willing to kill on a whim, fancies himself a ladies' man (probably not unjustifiably so), and isn't a team player. Thankfully, it doesn't take too much to get him to work his way back to present Six.
- Not quite, he doesn't have the memories, but he's going to try to be that person because of Rex's trust in the man he used to be.
- Asskicking Equals Authority: Subverted. He's arguably a better combatant than the 2nd through 5th most dangerous people in the world, but he's considered somewhat 'less dangerous' because of his Heart Of Gold.
- Badass in a Nice Suit: Never seen without his trademark green suit and tie.
- Badass Longcoat: His winter gear.
- Badass Normal: He's a normal human, and is considered the sixth most dangerous man in the world.
- Bifurcated Weapon: Inverted. If he wants to, he can combine his swords into an electromagnetic weapon with a variety of uses.
- Blade Below the Shoulder: Six wears his extendible swords mounted in sheaths on his forearms.
- Bodyguarding a Badass: Justified, as most of his job is to train Rex, keep him in check, and be his backup in combat.
- Charles Atlas Superpower: He is much stronger and faster than he has any right to be.
- The Comically Serious: It's a given if your team consists of a teenager and a talking monkey.
- Cool Shades: Six is never seen without without his trademark sunglasses, which only add to his mystique.
- Sunglasses at Night: No matter where he goes, even underwater! He finally takes them off in "Divide by Six".
- Cool Sword: He has two retractable katanas.
- Doesn't Like Guns: He's never seen wielding a gun.
- Dual Wielding: He dual wields his swords.
- The Glasses Come Off: With a twist; it's not to show him get ready for action (that's his day job), but to showcase his feelings more openly.
- Intergenerational Friendship: "Friendship" might be a little stretch, but he still looks after Rex in a fatherly way.
- Jerk with a Heart of Gold: He's incredibly distant, but he's demonstrated his fair share of kind moments. In "The Architect", he finds Rex celebrating with the townsfolk, and radios back that Rex isn't there.
- In "Wasteland" he agrees to keep Serge's underwater city secret.
- In "Divide By Six" it's shown that among the most dangerous people in the world he's The Heart of the group.
- In episode 36, he does whatever it takes to rescue and then cure Holiday's little sister, even seriously injuring himself to try and make the machine work by supercharging it with his magnetic swords. It works!
- Even when he was a Jerkass homicidal assassin, once upon a time, he wouldn't have been able to kill someone who had absolute faith in him. He also would have made it a priority to live up to the expectations of anyone who cared about him that much.
- And after the Time Skip, where even though his memories are still gone, he has his moments with Rex that show their bond is still there.
- Known Only by Their Nickname: Six gets his name because he is the sixth most dangerous fighter on earth.
- La Résistance: After a six month Time Skip.
- The Lancer: Six is Rex's trusty backup, no matter what the circumstances.
- Laser-Guided Amnesia: Gets hit with this in "Six Minus Six" when saving Rex from a memory recovery device that went wrong. Surprisingly, he doesn't get a Reset Button at the end, even after the six month flash forward.
- Leaning on the Fourth Wall: At the end of Episode 5, he asks "We have to do this every Friday?" This is the day the show aired.
- Lightning Bruiser: Ridiculously tough and possibly the fastest non-superpowered person on the show.
- The Men in Black: He has the look and the attitude down. Think Agent K with two fold-out swords.
- Papa Wolf: Lines will be crossed if you hurt anyone he truly cares about. And you do not want that to happen.
- But then in "Six Minus Six" he loses his memory from the last six years...including everything about Evos, Providence, and Rex. However, he was swayed to stay with Providence and not go back to being a mercenary due to Rex's trust in him.
- Parrying Bullets: He's been shown to cut bullets in half when fired from a machine gun.
- Red Oni, Blue Oni: The blue to Rex's red. (One of two)
- Possibly swapped as of "Six Minus Six" since his former mercenary self if still cold, at points its Rex talking him down now.
- The Stoic: He rarely shows any emotion. Not so much with Six of six years ago.
- Sugar-and-Ice Personality: So much; a prime example would be when he asked out Holiday with a completely straight face... even while holding her hand. In fact, a good chunk of the show's Heartwarming Moments page can be attributed to him.
- Tall, Dark, and Snarky
- Team Dad
- Finally admitted by Rex in "Six Minus Six"... but not under the best circumstances due to Six's memory loss.Six: I'm not your parent, kid!Rex: You're close enough! Or at least you used to be...
- They've reconciled at the end, but Six's memories are still gone. He says he's going to try and be the Six Rex knows because Rex trusts him.
- Finally admitted by Rex in "Six Minus Six"... but not under the best circumstances due to Six's memory loss.
- Would Hit a Girl: In "Six Minus Six".
- You Are Number 6: Is only the sixth most dangerous man in the world.
Profession: Providence Agent
Voice Actor: John DiMaggio
One of the earliest Providence captures, Bobo is an intelligent monkey who can speak his mind. Despite his darker origins, Bobo has chosen to fight for good in his own gruff way. Bobo is always by Rex's side and fiercely loyal to the boy who saved him. Bobo sports a "shoot then aim" attitude towards every situation that he and Rex find themselves in and is constantly giving absurd advice to Rex, encouraging his more mischievous side.
- Barefoot Cartoon Animal: Being a monkey, it would be pretty stupid of him to cover his prehensile feet with shoes.
- Crouching Moron, Hidden Badass: He doesn't tend to do much, but the flashback episode revealed that he used to do things like sneak into the Kremlin and try to press The Button...for fun. Along with that, he also proves to be rather capable in a fight, such as curb stomping Biowulf and Skalamander at the same time.
- Dark and Troubled Past: His past is a mystery, but from what he divulges in his rants it can be concluded he used to live in a harsh unforgiving jungle before and after becoming an Evo, then became an international criminal and world renowned prankster of dangerous proportions before being captured and drafted by Providence.
- Drives Like Crazy: Bobo seems to take a perverse pride in not having a licence. Granted he is a chimpanzee, but this does not stop him driving heavy armoured vehicles.
- Energy Weapons: His blasters, though they're rarely all that effective.
- Guns Akimbo: His main weapons are two large laser blasters.
- Humans Are Morons: Tends to state how silly and idiotic he finds the behavior of humans at times.
- Insistent Terminology: He does not wear a diaper. It is a "Simian undergarment."
- "It" Is Dehumanizing: Bites a girl on the beach in response to her asking "Does it bite?" specifically because she called him "it."
- Must Have Caffeine: Especially after a rough night. In "Crash and Burn", he finds the coffee maker is empty, so he eats the coffee grounds.
- Nice Hat: Never goes anywhere without his stylish fez.
- Talking Animal: Bobo's speech is a side effect of his Evo mutations.
- The Worf Effect: If he's involved in a fight, he tends to get knocked out of it before getting a chance to do much - and even if he isn't, he rarely accomplishes a great deal anyway. Averted, big-time, in "Robo Bobo."
- The Worf Barrage: Despite looking thoroughly impressive, those energy blasters of his don't have a much better track record than regular Providence solid-shot weaponry.
Profession: Providence Agent, civilian
Voice Actor: Fred Savage
Noah is in every way a regular kid, except for one thing: he is secretly employed by Providence to be Rex's friend. This deception ultimately weighs heavily on Noah, who genuinely likes Rex. Noah provides a dose of reality and normalcy in Rex's life and is there for him, whether it's to play a game of basketball or to offer advice.
- The Ace: It's eventually shown that Noah does in fact have his act together very well, being popular, intelligent, and surprisingly well-connected in school and life, as well as being a veteran, if not well practiced, combatant. Rex, by contrast, is a clumsy goof around people his age.
- Action Survivor: After a short stay at Providence boot camp, he's more than willing to grab a gun when it comes to that.
- Best Friend: He has no powers or special abilities, but is valuable to Rex due to the emotional support he provides him with.
- Becoming the Mask: Was hired to be Rex's civilian friend, but would come to regret this decision when Rex found out as he grew to like spending time with him. After some convincing by Holiday, they become friends for real.
- Conflicting Loyalty
- Heterosexual Life-Partners: Becomes truly good friends with Rex, even letting him stay at his house when Providence HQ was under construction.
- Ordinary High-School Student: Double Subverted; he looks the part, then his secret is out, and then it's revealed that he is by all means a high school kid with normal problems other than Providence.
- Red Oni, Blue Oni: The blue to Rex's red. (One of two)
- Took a Level in Badass: After going through some Providence basic training (even though he technically dropped out) he's shown the ability to use the Providence assault rifle and even hammered Van Kleiss with a forklift.
- Unfazed Everyman: In the very first episode, Noah is dragged to Abysus with Rex and Bobo. He doesn't seem remotely bothered by this. It's a trait he never loses.
Dr. Rebecca "Doc" Holiday
Profession: Providence Agent, nanotechnologist
Voice Actor: Grey DeLisle
Genius scientist extraordinaire, Doctor Holiday works for Providence as tech support, but her main focus though, is Rex. She monitors his emotions, the state of the nanites inside him and his general health. Holiday has taken a much more maternal interest in Rex, and seems to be the only person at Providence who truly cares for his emotional well-being. Holiday is not afraid to speak her mind and though she respects authority, she answers first and foremost to science. She's quick witted, clever and direct. It's almost always impossible to pull something over on Holiday.
- Badass Bookworm: When you consider the fact that she's more scientist.
- Brainy Brunette: Fits all of the stereotype.
- Cool Big Sis: With some flavor of Big Sister Instinct when it comes to Rex and, most especially, her EVO sister, Beverly.
- Crazy-Prepared: Really, Holiday? You either had ready, or set up in under 8 minutes, an interrogation room with hand scanners, trapdoor, decending wall-thingy, Breach-sized restraints, and PROBE CANNON?
- Education Mama: Apparently becomes one to Rex at the end of "Without A Paddle." Played for laughs.
- Hot Scientist: Rex has a crush on her, and it is strongly implied that he is not the only one of her patients to do so.
- Ink-Suit Actor: Her design arguably resembles her voice actress, Grey DeLisle.
- Knight Templar Authority Figure: Though not technically his mother, she'll be absolutely ruthless to anyone she knows has hurt Rex (not that Rex can't take care of himself, mind you, but in situations where he's unable to act).
- La Résistance: After a six month Time Skip.
- Lethal Chef: For all her technological/medical skills and sexy labcoat, she can somehow manage to make a cake that requires no less than an authentic Japanese tanto to cut. (With Rex and Six expressing uncertainty as to whether even that would be sufficient.)
- Letting Her Hair Down: Inverted; it was down when Rex was first brought to Providence. Seems she tied it up later.
- Mama Bear: Mess with Rex, Beverly, or 9to a lesser extent) Noah, and she will come down you like a ton of bricks.
- The Medic : One of her main tasks is patching up the frontline fighters.
- More Dakka: In contrast to Six, she usually fights with heavy artillery.
- Named After Somebody Famous: Shares a surname and informal title with Old West gunslinger John Henry "Doc" Holliday.
- Parental Substitute: The closest thing Rex has to a mom in the series.
- Shameless Fanservice Girl: When it comes to her patients, at least, but being a doctor, it's understandable and not unusual. She will, however, mock their Goofy Print Underwear.
- She Cleans Up Nicely: In "Leader of the Pack".
- Shipper on Deck: For Rex and Circe.
- The Smart Girl: For Providence.
- Tsundere: A type B towards Six.
Profession: Leader of Providence
Voice Actor: J. K. Simmons
The Agent in charge at Providence, his ultimate quest is to rid the world of E.V.O.s (Exponentially Variegated Organism). White harbors an almost irrational fear of nanites, to the point where he never leaves his stark white office, which also doubles as a high-tech nanite-free clean room. As far as anyone can tell he never leaves the sterilized room he calls an office, as apparent by his flour white skin and that he keeps a jar of milk in a drawer. While there is not exactly a heart of gold hidden beneath his gruff exterior, he does genuinely want to do the right thing, and is often faced with making really tough decisions. Once a friend and partner of Six, their relationship is showing signs of serious strain.
- Anti-Hero: He can be reasonable, and it's shown that he is a competent, if stern and cynical, leader.
- Authority Equals Asskicking: He may be the boss and a shut-in most of the time, but when he does need to kick ass, he can.
- Before he was the boss, WK was a competent field agent for Providence. He even fought Agent Six in hand-to-hand combat and did pretty well for himself.
- Back-to-Back Badasses: He and Six used to be this, back when he was actually in the thick of it during the early days of Providence.
- Big Good: Just barely. He is in charge of Providence and all of the good guys, but it's a stretch to call him a good person.
- Bubble Boy: He has a good justification for this in "The Plague". Being the only person on the planet free of nanites, he's the only living human who can be unquestionably trusted not to go Evo and turn on his own people at a bad time. What's ironic about it is that he wasn't always uninfected; he was stuck in a molecular deconstruction chamber which should have killed him, but Rex shut it off just soon enough for it to remove only his nanites.
- Crazy-Prepared: He has a Mini-Mecha if he has to go outside. If that's destroyed, he's wearing another suit of powered armor under that. And that suit of armor is modular with redundant sections in case it's damaged.
- Defrosting Ice King: As of "Payback". He seems to appreciate Rex much more as a person AND ACTUALLY LAUGHED AT SOMETHING REX SAID.
- And later in Heroes United (which despite being a crossover, is canon for GR), he opted to stay and fight Alpha with Rex and Ben, despite the fact that if his armor took any more damage he'd be exposed to nanites for sure. Why? Because Six wasn't there due to possibly life-threatening injuries, and White feels that staying with Rex is what Six would do.
- Good Is Not Nice: Played very straight.
- Hero Antagonist: In "Outbreak".
- Jerkass: Knight doesn't really do 'polite', let alone 'cordial'.
- Later episodes have him developing into a Jerk with a Heart of Gold.
- Kill 'Em All: Though he at least is willing to try less extreme methods before resorting to this.
- La Résistance: After a six month Time Skip.
- Locked into Strangeness: His hair and skin color are the result of the accident that removed all the nanites in him.
- Man in White: His entire color motif is white. His skin color, clothing, office walls, he even drinks milk.
- Mini-Mecha: Even though he's paranoid about being infected by nanites, this hasn't stopped him from building one of these so he can go on missions when he absolutely has to.
- Minored In Ass Kicking: For much of the show, White Knight is seen as the head of Providence, and the one human not contaminated with nanites. Then the events of "plague" puts most of the country to sleep, and White is forced out of his bubble to help Rex, and the viewer learns that White can kick ass with the best of them.
- Not So Stoic: As evidenced by 'Grounded', Knight does have a sense of humour. It's not particularly nice, but it's there.
- Perpetual Frowner: We rarely see this guy smile.
- Pet the Dog: Want to know how he lost his nanites? He pulled a Heroic Sacrifice to save Six's life. He only survived due to Rex's intervention.
- And in Heroes United he risks being infected again to help Rex and Ben because it's what Six would do.
- In the finale, he absolves Six of the order to kill Rex should he go into his superpowered Kaiju form. You wouldn't expect that at all given his behavior in the first season.
- Powered Armor: Wears it beneath the mecha.
- Start My Own: Started his own Providence after being fired.
- Super OCD: A more subdued example then usual, but even before the E.V.O. incident, he was said to have a problem with germs.
- We Have Reserves: He berates Rex for saving soldiers, at one point saying that they knew if they died, they'd be replaced.
- Well-Intentioned Extremist: Bordering on Knight Templar. He backs away from that sometimes, but is always this trope at best.
Rex's older brother and one of the scientists who worked on the nanite project. He managed to escape the lab he worked in before the nanite explosion, only for his portable lab to move at light speed(!) for 15 minutes (5 years in real time). Knew Van Kleiss and Rex before the nanite incident.
- Absent-Minded Professor: He's a genius and a nice guy, but a little... kooky.
- Cannot Spit It Out: He has an amazingly bad habit of refusing to volunteer any information unless he feels like doing so. It took an entire season just to get him to reveal the truth behind the nanite event.
- Crazy-Prepared: And yet he didn't think to install a bathroom on his ship.
- Crouching Moron, Hidden Badass: Notable in that the badass part comes before the moron. Sure, he's a goofball and Cloudcuckoolander, but he pretty much upstages Providence in his debut episode with his technical prowess and knowledge of nanites. Rex does stop him before he takes on Six, but hey, that's pretty good for a guy who's technically a non-combatant.
- He isn't afraid to go up against the likes of Hunter Cain to defend Rex, as seen in "Night Falls". Papa Wolf Mode kicks in.Caesar: "You mess with my brother, you mess with me."Cain: "Who are you? You an EVO?"Caesar: "No, I'm a scientist" *shocks Cain with a probe*
- He isn't afraid to go up against the likes of Hunter Cain to defend Rex, as seen in "Night Falls". Papa Wolf Mode kicks in.
- HeelFace Turn: He promptly turned back to Rex's side after.
- Friendly Enemy: Even after Rex had declared himself estranged from Cesar, they still casually call each other and are surprisingly civil. His rather callous attitude upon the revelation of his FaceHeel Turn was toned down in later episodes.
- I Did What I Had to Do: Created the Nanite Event to prevent the superpowerful Meta-Nanites from falling into the wrong hands.
- Implacable Man: Upon his introduction. His suit and the machine he used to disable Providence tech couldn't be stopped by the veritable army that was thrown at him.
- In the Blood: Note Rex's pre-amnesia Manipulative Bastard double crossing tendencies. Now taking into account Cesar's own recently revealed lack of moral compunction...
- Karma Houdini: He has so far escaped any sort of punishment for the Nanite Event. Compare Rylander who more or less died, and Peter Meechum who became an EVO (can't get more karmic than that). Van Kleiss is a villain, though he's had a pretty rough time of it, too.
- He finally got punched by Rex in "Endgame Pt.2", but he's still loose out there plotting another big experiment that may create another disaster like the Nanite Event.
- Long Lost Sibling: He's been separated from Rex for 5 years.
- Mad Scientist: He created ZAG-RS. Granted, he (probably) wasn't responsible for any of its mishaps...
- In "Written In Sand" Van Kleiss flat-out states that César is responsible for the Nanite Event, the worst disaster in human history. Eventually, Cesar admits this was true, but he had good reason for it.
- He also created Alpha, who turned into an Omnicidal Maniac.
- It was also revealed that the Nanite Event happened in order to prevent not just the Consortium but Van Kleiss from getting their hands on the Meta Nanites. Doesn't make him any less mad a scientist, though, especially considering his final scene.
- Mike Nelson, Destroyer of Worlds: He has good intentions (sort of) but his inventions have come dangerously close to ending all life on Earth several times. It's hard to think about what would happen if he was trying to do intentional harm to humanity.
- Nice Job Breaking It, Hero!: If only he told Rex about why him and the other scientists were helping Black Knight then Rex wouldn't have prevented the Meta Nanites from combining and giving the Consortium their powers.
- Not Distracted by the Sexy: The one thing he doesn't seem distracted by. The most he can say about Doc Holiday is that she seems "very smart." Rex is stunned by this.
- Although not distracted, he is aware of her good looks, as he had referred to her as "bonita" (means 'beautiful' in Spanish) in his debut episode while rescuing Rex.
- He can be caustic and hostile at the drop of a hat if challenged. Even to Rex. Hell, the way he eventually starts treating Rex hints at quite a cruel streak.
- The Sixth Ranger: After joining Providence mid-season 2. He later becomes a Sixth Ranger Traitor.
- Theme Naming: Caesar is a title used by Roman emperors, tying in with how Rex is Latin for "king".
- Too Clever by Half: Smart enough to make advanced artificial intelligences—too much of a Ditzy Genius to program appropriate safeguards.
- Well-Intentioned Extremist: Whatever he's up to while working for Black Knight he apparently think it justifies the means no matter what. The other scientists who worked on the nanite program appear to agree with him too. He was working with Providence in order to finish the machine that would allow Rex to have all the Meta Nanites as was his and their parents original intentions.
Captain CalanProvidence Captain, and major ally to White Knight. He makes several appearances throughout the show.
- Badass Normal: Not to Six's extent, but he's still competent in a fight
- Death from Above: When getting into a fight with the Pack over Rylander's labratory Providence takes a few losses, so Calan orders them to bomb the lab.
- Empowered Badass Normal: Once turned into an evo.
- Good Scars, Evil Scars: has a scar over his eye. As seen in Promises Promises; he got it in the five years from when Rex was recruited, to the present.
- Hero of Another Story: He's a high ranking providence agent who does numerous things behind the scene, like international thievery and his actions as a Reverse Mole.
- Mauve Shirt: The most important/recurring providence agent outside the main protagonists/antagonists.
- Reverse Mole: He and at least 4 other Agents are revealed to be working for White Knight even after he's defected. Calan himself helped White escape after he faked his suicide.
- Undying Loyalty: To White Knight even after White's defection