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The Flex Fighters

     Jake "Stretch" Armstrong

Voiced by: (English) Scott Menville

Leader of the Flex Fighters, Jake was a perfectly normal High School student with a jam-packed schedule, attending Charter City's "Academy of Future Leadership". After an accident while free-running dropped him and his two friends into a Rook Unlimited lab, they were exposed to a manufactured compound called "flexarium" and given unique Rubber Man-esque abilities.

  • Accidental Dance Craze: Stretch starts one when a case of Power Incontinence crash-lands him on a breakdancing stage, then a video of him contorting out of control goes viral.
  • Adaptational Modesty: He is fully clothed in here, while his original version just wears a Speedo and nothing else.
  • Adorkable: He's called a nerd by Ricardo, is very passionate about schoolwork, plays violin and cello, and is extremely excited about Rook Unlimited technology. Also, when he tries to talk to Riya for the first time, he becomes an awkward, babbling mess.
  • The Ace: Has shades of this. His grades have barely slipped since he began having a double life, he still manages to attend most of his extracurriculars, and mastered his powers very quickly.
  • Buffy Speak: A few examples, like "lie sandwich" and "secret ninja party."
  • Color-Coded Characters: Blue. His uniform is blue, along with his superhero suit. He also has blue stripes on the hoodie he wears as casual attire.
  • Did Not Get the Girl: Has been fantasizing about Riya since she first transferred to their school, and finally gets the nerve up to ask her out to their school dance. When she says yes, an episode of Power Incontinence means he's unable to pick her up, and having Ricardo do him a favor and take her to the dance ends with them unexpectedly falling for each other, with Jake left out in the cold... It doesn't stick, though.
  • Dudley Do-Right Stops to Help: Stretch will often prioritize protecting Innocent Bystanders over completing the mission ASAP, which creates internal drama in "The New Normal", when the Flex Fighters' latest allies recommend staying focused on the mission.
  • Expy: Jake is a blond teenaged superhero with a micromanaging father and a absent mother, not unlike Adrien Agreste.
  • Faking the Dead: The Flex Fighters after the Gentleman appears to have flattened them, complete with Stretch greeting the Gentleman's captive in a ghostly tone.
  • Gadgeteer Genius: He's able to create a helmet that tracks and attracts the malfunctioning stretchipedes out of stuff found in Nathan's garage.
  • Hair of Gold, Heart of Gold: He's blond, and cares greatly about his friends, father, and the citizens of Charter City.
  • Helmets Are Hardly Heroic: Jake is the leader of the team and the only one not wearing some sort of protective headgear. Unless one counts his goggles.
  • Hero with Bad Publicity: Starting with "The Breakout", he and the other Flex Fighters become this thanks to Rook making them out to be public enemies.
  • Hologram: Jake gains a holographic double in "Split Personalities", to dissuade his father from noticing that he's gone out to search for the new Multi-Farious.
  • Likes Clark Kent, Hates Superman: At least until episode #12, he prefers Riya's true self to Blindstrike.
  • Living a Double Life: Big time. Hiding his superhero career from his father is one of the main conflicts for his character.
  • Only Child Syndrome: Jake has no siblings.
  • The Only One: One of the Tech Men in "Crisis at the Cleo" warns Stretch, "Only you can save Charter City from what's coming." By the end of "Masters of Order", Stretch remains the only conscious kid unaffected by the Tech Men's mind control, due to an over-exposure to ceptio-arcide.
  • Personality Powers: Over-scheduled Jake becomes the more flexible Stretch.
  • Power Incontinence: Experiences brief incidents of this in "Singularity Event". It's resolved by the end of the episode.
  • Primary-Color Champion: His Flex Fighter suit is mostly two shades of blue.
  • Rubber Man: A more literal example than his teammates; he can stretch every part of his body and is extremely flexible.
  • Secret Identity: Jake adamantly insists he and the other Flex Fighters have these before they agree to work for Rook. It comes in handy when Rook later makes them public enemies.
  • Ship Tease: Jake and Riya get some starting in episode #12. By the end of season two, they develop a mutual respect for each other, but their expressions of it in the finale don't include making any romantic-looking physical contact.
  • So Much for Stealth: Stretch often fails at acting sneaky. When Dr. C hears him spying on her, she almost laughs at his clumsiness.
  • The Spock: He makes the decisions based on intellect and logic, such as when he believes he's figured out where Blindstrike hides and how Stretch Monster is able to move about Charter City undetected.
  • Stalker with a Crush: A more innocent version than most examples, but he's had a crush on Riya for over a year, dreams about marrying her and having "2.5 kids" with her, all before he's spoken to her even oncenote .
  • Unconfession: All attempts he makes during season one to tell his father about his double life get interrupted.
  • White Male Lead: Stretch is the only white boy in the team (maintaining some visual consistency with the Kenner and Cap Toys Stretch Armstrong dolls), and the show is named after him.
  • Younger and Hipper: This incarnation of Stretch seems younger than previous ones.


     Nathan "Wingspan" Park

Voiced by: (English) Steven Yeun

Jake's childhood friend, a rather neurotic young man with seven siblings. After the accident that gave him and his friends superpowers, he gains the ability to glide using retractable flaps between his arms and legs. Nathan is much more cautious and paranoid than his teammates, often voicing his concerns in battle. After becoming Rook Unlimited's official superhero team, along with Jake and Ricardo, he is given the name "Wingspan."

  • Adorkable: Even moreso than Jake. He has a tendency to babble when uncomfortable or worried, is extremely nervous at times, and seems to constantly assume the worst thing that can happen will happen. Given that he also attends The Academy of Future Leadership, it can be assumed he's also quite intelligent.
  • Asian and Nerdy: Is Korean, and pretty geeky.
  • Big Brother Instinct: He has some of this towards Isabelle, judging from how angry he gets at Ricardo for disappointing her by not showing up to her spelling bee. He doesn't even wait to talk to him about later - he calls him on his cellphone immediately after the show is over to chew him out for it.
  • Cannot Keep a Secret: Nathan's carelessness results in his grandfather discovering that he's Wingspan. In season two, Nathan deliberately reveals himself to two others, Erika and Gabe-Farious' sensitive piece.
  • Color-Coded Characters: Wears a green tie while in his school uniform, his superhero suit is green, and his civilian clothes are also green.
  • Cowardly Lion: Wingspan evolves from a total worrywart, to one who'll willingly take some risks, both in and out of battle.
  • Dressing as the Enemy: Omni-Mass and Wingspan infiltrate the Tech Men by disguising as some of them.
  • Freeze-Frame Bonus: In a gallery of pictures showing each Park kid celebrating his or her first birthday, baby Nathan holds a toy airplane — an omen that someday, he would literally soar.
  • Height Angst: Don't call him "short stack", even if it's a pretend fight.
  • Heroes Want Redheads: Has a massive crush on the red-haired Erika.
  • Internal Reveal: Season two has Nathan confess to Erika that he's Wingspan.
  • Keeping Secrets Sucks: Fabricating alibis to Erika regarding his absences stresses him out, until he acts upon a dream of telling her the truth.
  • The Kirk: Not as smart or logic-minded as Jake, but not as impulsive as Ricardo.
  • Massive Numbered Siblings: Has six brothers and one sister, and claims he himself loses count of how many siblings he really has. If that weren’t enough, he’s also sandwiched between them.
  • Mind Control: He ends up on the receiving end after falling victim to Dr. Dreamscape.
  • Nervous Wreck: Has tendencies that resemble this. By his own admission, he's normally scared of everything.
  • Not Quite Flight: His abilities enable him to glide for great distances, and he's also been shown taking off from the ground, but he doesn't fly in the traditional sense.
  • Personality Powers: Nathan gets weighed down by having to live up to the Park family legacy, but rises free from that pressure as Wingspan.
  • Primary-Color Champion: He's the only Flex Fighter to avert this, as his suit is mostly two shades of green.
  • Rubber Man: To a lesser degree than Jake; his main ability is his wingspan, but he can also stretch his limbs considerably more than an average human.
  • Shipper on Deck: He helps cheer Jake on when the latter asks Riya to the dance.
  • Strange Minds Think Alike: He and Erika start hanging out after they discover that they share some social quirks, listed in her folders.
  • Successful Sibling Syndrome: Nathan suffers from this, as Mr. Savic points out to Nathan his older brothers were "brilliant" at botany while he only managed a B-minus.
  • Throwing the Fight: Nathan purposely loses a duel with Gabe (who seems to have less experience with actual fighting) in order to avoid suspicions of himself as a Flex Fighter.

     Ricardo "Omni-Mass" Perez

Voiced by: (English) Ogie Banks

A new student who recently transferred to the Academy for Future Leadership. After being paired with Jake and Nathan for a botany project, he convinces them to have a little fun, which eventually leads to the events that give them their powers. Ricardo is given the ability to alter the size and mass of different parts of his body, and is dubbed "Omni-Mass" by Rook Unlimited.

  • Aerith and Bob: The Flex Fighters' names are Stretch, Wingspan, and... Omni-Mass.
  • Affectionate Nickname: Nathan and Jake sometimes shorten Omni-Mass name to "Omni."
  • Break His Heart to Save Him: A minor, platonic example of this, but Ricardo starts avoiding Nathan and his family out of concern that he'll just be moving again soon, so there's no reason to get attached. Thankfully, he later decides this is a bad idea.
  • Color-Coded Characters: Red. His superhero suit is red, as is his signature red hoodie, which he wears in and out of his school uniform.
  • Dating Catwoman: Might have shades of this when Riya is revealed to be Blindstrike, but it quickly becomes a Subverted Trope when Riya/Blindstrike turns out to be on the Flex Fighters' side.
  • Deadpan Snarker: Usually the first to make a snarky comment at anyone.
  • A Dog Named "Dog": He gets a cat in the second season, which only answers to, "Cat".
  • Dreadful Musician: He dreams of playing guitar in a band with the Freak Sisters, but finds a real guitar harder to play.
  • Dressing as the Enemy: Omni-Mass and Wingspan infiltrate the Tech Men by disguising as some of them.
  • Dude, Where's My Respect?: After the events of "The Age of Flexarium" shrink the Flex Fighters' fanbase, Omni-Mass often misses the days when crimefighting put him in the limelight.
  • Has a Type: While he hits on any girl, Riya and the Freak Sisters suggests Ricardo is a gender inversion of All Girls Want Bad Boys.
  • Hidden Depths: Ricardo may seem carefree but his parents work hours and constant moving from city to city causes him some sorrow though he doesn't hold it against them. He is also very good at math and is fluent in Latin, and as revealed in issue 3 of the comic book tie-in, is passionate about the debate team, but loses interest after he has to quit to move to Charter City, and lets down a friend in the process.
  • Jerk with a Heart of Gold: He may not be the nicest person, but he still does what he can to be a hero.
  • Jumped at the Call: Is the only one of the Flex Fighters who is immediately overcome with glee at the thought of being a superhero.
  • Likes Clark Kent, Hates Superman: At least until episode #12, he prefers Riya's true self to Blindstrike.
  • Lonely Rich Kid: While never stated as being exceedingly wealthy, Ricardo somehow got into the Academy for Future Leadership with very poor grades, and lives in a beautiful penthouse apartment. The lonely aspect comes from his parents being perpetually absent.
  • The McCoy: Very impulsive, doesn't hesitate to mock his teammates and doesn't always think things through.
  • New Transfer Student: Ricardo had only recently started attending the Academy for Future Leadership in the first episode.
  • Not So Different: Has a moment like this with Riya when he picks her up for the school dance in place of Jake. It eventually leads to a mutual attraction between them.
  • Only Child Syndrome: Ricardo has no siblings.
  • Personality Powers: Ricardo gets pulled out of place whenever he has to move to another town or city, but can stand firm as Omni-Mass.
  • Primary-Color Champion: His Flex Fighter suit is mostly two shades of red.
  • Really Moves Around: Ricardo has moved around enough to have a pretty jaded view of high school life by the time the series starts.
  • Right for the Wrong Reasons: In "The Age of Flexarium", after the Flex Fighters learn that Blindstrike is Riya in disguise, Omni-Mass argues that doesn't necessarily mean that Riya is evil, falsely theorizing that Dr. C has her under mind control.
  • Rubber Man: Just like Nathan, has a slight version of this to go with his mass and size related powers.
  • Ship Tease: When Ricardo first sees Riya, he agrees with Jake that she looks very beautiful. At the dance, Ricardo and Riya discover that they share some likes and dislikes, resulting in them continuing to hang out with each other — much to Jake's jealousy.
  • Shipper on Deck: Encourages both Nathan and Jake to talk to Erika and Riya, respectively.
  • Staying with Friends: In season 2, Ricardo learns that his father has another new job, and it looks like the Perezes will have to move out of Charter City. Fortunately, Ricardo's dad arranges for Ricardo to live with the Parks until the Academy's current school year ends.
  • Stepford Smiler: Ricardo's parents are almost always absent, but he acts like being left alone all the time is great, since he can do whatever he wants and just eat cold cereal for dinner. However, it's shown in "Singularity Event" that he's very hurt when his dad can't make it home to have dinner with him. He also jumps at the chance to join Nathan's family for dinner, and which ends up becoming a regular thing. On top of that, some of his less noble behavior, like skipping out on Isabelle's spelling bee, stems from believing that putting forth his best self won't be worth it, since he's convinced his family will eventually just move away again and hurt everybody who might have bonded with him.
    Ricardo: Nobody should count on me. I always disappoint sooner or later.
  • Visual Pun: Sometimes Omni-Mass develops a big head while boasting, especially if he brags before performing a headbutt.

Rook Unlimited

     Jonathan Rook

Voiced by: (English) Wil Wheaton

The creator and owner of Rook Unlimited. Jonathan Rook basically rebuilt Charter City and turned it into a incredibly advanced scientific utopia. After the Flex Fighters gain their powers, he immediately hires them to be heroes, sponsored by his company. For the first 13 episodes, he does his best to assist them during their missions.

  • All for Nothing: When he was a kid, he wanted to get into the Epsilon Society, and when he caught their eye, he had a choice to make: Join them and forsake his life (And thus abandon his deathly ill mother) or not. When he faltered on the answer, the recruits left him alone. When he went to his mother's hospital, she died while he was gone. He is still bitter about this and thus is his Freudian Excuse.
  • Benevolent Boss: Despite keeping his PR team up all night at one point, he treats his employees kindly, and even gives Brick and Mortar a second chance after their bank robbery fiasco.
  • Broken Pedestal: The Flex Fighters think highly of Rook to the point of Stretch admitting how cool he'd be as a dad. Then, not only do they discover he's been keeping the criminals they defeated in cells to run torturous experiments on them, he's Stretch Monster and he's been using their trust to advance his plans.
  • Bunny-Ears Lawyer: Rook's a certified genius, an inventor, and basically owns Charter City, but is positively giddy at the thought of his company having officially sponsored superheroes. And then there's the fact that one of his earliest scenes has him riding a hovering segway around instead of walking.
  • ...But He Sounds Handsome: In hindsight, it was a bit suspicious how Rook heaped plenty of praise on Stretch Monster, even calling him a genius at least once.
  • Canon Character All Along: He is the true identity of Stretch's original Arch-Enemy, Stretch Monster.
  • Chessmaster: Ohh, yeah. Hires the boys as superheroes instead of putting them in jail, and keeps all the villains and monsters for experiments, all so he can gradually gain more and more control over Charter City, up to and including a satellite that has access to everyone in the city's personal information, and the city's own defense systems.
  • Crazy-Prepared: Has a training area ready for the Flex Fighters the day after they gain their powers, and also has a large transport vehicle, along with smaller, personalized ones, created just in case they later become necessary. That isn't even touching on the specialized prison cells he had ready for each of the super-villains as soon as they were captured.
  • Did Not Think This Through: His decision in Season 2 to send all of his security team to fight the Flex Fighters backfires when the Tech Men use the opportunity to break into Rook Unlimited undetected.
  • Eccentric Millionaire: Rebuilds a whole city from the ground, hires a former gang member as his right hand man, and instead of punishing the teenagers who accidentally destroyed one of his research labs, he hires and trains them to be superheroes.
  • Gadgeteer Genius: He boasts, "I didn't become a millionaire just by inventing cool stuff, although I did do that", with the episode "Rook's Story" showing some of it off.
  • Manipulative Bastard: Not only does he manipulate the Flex Fighters into bolstering his public image, then turn against them the minute they figured out his true intentions, he also manipulates almost every supervillain in the series by giving them powers as Stretch Monster, all so they could eventually be captured and studied by his alter ego.
  • Nice Job Breaking It, Hero!: Near the end of season two, he attempts to save the people of Charter City from mind control by the Tech Men's Smart Marks, but it backfires when the Tech Men steal his device for reprogramming the Smart Marks' signal, and use it to control everyone in the city.
  • Out-Gambitted: The Tech Men, and by extension, Kane, play him like a fiddle with his obsession to capture the Flex Fighters.
  • Professor Guinea Pig: While Rook boasts that Hyper-Flexarium could end all disease, Dr. C and Dr. Isha Dashti both warn him against testing it on people, but he injects himself, anyway. Cue Rook's first transformation into Stretch Monster. Dr. C and Rook part ways afterwards, when the experiment going horribly wrong convinces her and the Dashti scientists to prevent anyone else from suffering the side effects of Hyper-Flexarium medicine.
    Rook: Never underestimate my tolerance for risk.
  • Significant Wardrobe Shift: Takes to wearing more blacks in his civilian wardrobe after he is revealed to be Stretch Monster.
  • Smart People Wear Glasses: "Rook's Story" shows him wearing spectacles in most of the flashbacks.
  • Teeth-Clenched Teamwork: He teams up with the Flex Fighters, Dr. C, Blindstrike, and later Officer Reynolds against the Tech Men. Only one of them doesn't seem to hate his guts.
  • Ungrateful Bastard: In the second season finale, he "repays" people who save Charter City from the Tech Men by refusing to clear the Flex Fighters' names, gassing Dr. C, almost trapping Blindstrike, and replacing Officer Reynolds (who releases Rook and Dr. C from the Tech Men's mind control earlier in the episode) with his Flexarium test subject.
  • Waistcoat of Style: He usually wears a black suit vest.
  • Worthy Opponent: Views Dr. C this way.

     Malcolm Kane

Voiced by: (English) Keith David
Rook Unlimited's Head of Security. Despite his initial dislike and distrust of the Flex Fighters, he becomes a mentor to them and slowly warms up to them.

  • Badass Baritone: Well, he is voiced by Keith David, so he naturally has a deep, booming voice.
  • Badass Normal: Has no special powers, but can easily hold his own in a fight where he's greatly outnumbered.
  • Good Is Not Nice: Kane will be the first to tell The Flex Fighters their faults and failures during missions but he slowly warms up to them; very slowly though. Subverted when it reveled he was never good to begin.
  • Heel–Face Turn: Made one sometime before the events of the series. He used to be a gang member, but left to work with Rook, whose main goal was to clean up the city. Averted when it revealed he was never good to begin with.
  • Hyper-Competent Sidekick: While Rook is by no means clueless or stupid, Kane takes a far less casual approach to his role.
  • Genius Bruiser: He's Rook Unlimited's head scientist, and is also very skilled in hand-to-hand combat.
  • Jerk with a Heart of Gold: Is incredibly tough on the Flex Fighters, and questions many of Rook's decisions, but only because he genuinely cares about the people of Charter City. Subverted later on, where it's revealed that he's the leader of The Tech Men.
  • The Mentor: He's given this role when it comes to overseeing the Flex Fighters. Initially, he's less than thrilled.
  • Mole in Charge: Head of Rook Unlimited Security and leader of the Tech Men.
  • Papa Wolf: He's definitely somewhat protective of the Flex fighters, though he does his best to keep it from showing. Later subverted when revealed that he never cared for them.
  • Secret Secret-Keeper: "Rook's Story" reveals that he discovered Stretch Monster's true identity years ago, even though he claims in "The Breakout" not to believe the Flex Fighters' "conspiracy theory" that Rook is the monster.
  • The Stoic: Nathan describes him as an "angry robot".
  • Villainous Breakdown: Once his master plan is foiled, the rest of the Tech Men abort and go into hiding, while he desperately tries to continue the plan before being taken out.
  • "Well Done, Son!" Guy: Absolutely has shades of this with the Flex Fighters. Lampshaded when a star-struck Ricardo at one point asks if Kane will be his father.
  • Well-Intentioned Extremist: He ultimately does want to make Charter City a safer place, but would achieve this through deceit and mind control.


     Officer Reynolds 
Voiced by: (English) Will Friedle

A high-ranking security officer at Rook Unlimited.

  • Bound and Gagged: This happens to him in "Doomsday Clock", before a Flexarium Monster starts impersonating him.
  • Jerk with a Heart of Gold: He's stern and strict, but no one can deny the good he does.
  • Hero Antagonist: Charged with arresting the Flex Fighters after "The Age of Flexarium" and doesn't know that they're innocent.
  • The Only One: By the start of "Doomsday Clock", Reynolds has become the only adult in Charter City unaffected by the Tech Men's mind control, since he applied ceptio-arcide on himself before the frequency activated.
  • Token Good Teammate: Seems to be the only person in Rook Unlimited that isn't currently or previously evil. He also willingly helps the Flex Fighters defeat the Tech Men in Season 2. It's because of this trope that Rook secretly has him replaced by a shapeshifter.
  • Vague Age: His voice actor predominantly voices young men, but his white hair makes it questionable how old he's supposed to be.

     Brick and Mortar 
Voiced by: (English) Wayne Knight (Brick) and Troy Baker (Mortar)

Two inventors who give up robbing banks after joining Rook Unlimited.

  • Adorkable : They have some goofy personalities and are adept with technology, thus making them surprisingly endearing.
  • Affably Evil: They're actually pretty friendly, despite also being semi-antagonists in their first episode.
  • Anti-Villain: Sure, they rob a bank, but they plan to pay back everything they stole and they genuinely want to help others with their inventions.
  • Beware the Silly Ones: They may get into arguments about frozen yogurt flavors and look kinda weird, but that doesn't make them any less dangerous, since they really know how to use their devices to both effectively fight and service their plans.
  • Chekhov's Gun: Brick packs some multi-sided dice before escaping the Tech Men, explaining to Mortar that he doesn't want the nerdy Tech Men to steal them. When the Tech Men catch up to the duo, Brick trips them with a "saving throw".
  • Curb-Stomp Battle: Surprisingly, they deliver one to the Flex Fighters, and another one to the Tech Men. Despite seeming like obvious harmless villains, their weapons are actually extremely effective, and they essentially mop the floor with their opponents. After the Tech Men disable Brick's and Mortar's weapons, Brick even improvises a low-tech means of winning.
  • Fat and Skinny: Brick looks fatter than Mortar does.
  • The Fool: They generally come off as clueless but they seem to consistently display good instincts about what's going on in Charter City. They turn down Stretch Monster's help and later some mind probes freely offered to the general public.
  • Heterosexual Life-Partners: They describe each other as best friends, and are trying to work together to create something that would genuinely change the world.
  • I Ate WHAT?!: Brick apparently has a tendency to taste experimental substances in Rook's lab, such as an adhesive square that Brick mistakes for taffy.
  • Jerk with a Heart of Gold: While they rob a bank, they only do it so they could create technology to potentially help the entire world. They're also some of the few first season enemies to decline assistance from Stretch Monster, until they do accept an offer to work for Rook.
  • Justified Criminal: Episode #9 paints Brick and Mortar in a sympathetic light, by revealing that they robbed the bank in order to fund their efforts in constructing a teleporter.
  • Not-So-Harmless Villain: They initially don't seem to be all that intimidating, but then they start to fight, where they almost immediately wipe the floor with whoever they're up against.
  • Smarter Than You Look: They certainly don't look all too bright, but they're actually technological geniuses.
  • Spanner in the Works: After Rook collects data needed to create another Flexarium army, Brick, Mortar, and Mark Armstrong accidentally help wipe it out, as further detailed in Mark Armstrong's folder.
  • Teleport Gun: The focus of their research.
  • Those Two Bad Guys: Act as semi-antagonists and also are never seen without the other.

Classmates And Teachers

     Riya Dashti

Voiced by: (English) Nazneen Contractor (teenager) , Kathreen Khavari (young girl)

A girl who transferred to the Academy for Future Leadership roughly one year ago, whom Jake initially has a crush on.

  • Amateur Sleuth: Even before she became Blindstrike, Riya managed to figure out that Rook killed her parents, and that Dr. C survived the plane crash.
  • Ambiguously Brown: Riya has dark skin, but bright green eyes and purple hair. Her surname and her parents' accents suggest that she may be Middle Eastern.
  • Badass Normal: Has no special abilities other than hand-to-hand combat and Flexarium weapons, but is able to stand her ground against the Flex Fighters.
  • Better as Friends: Currently to think this of her relationships with the Flex Fighters.
    • Jake and Riya share some problems and wants, but his attempts at banter fail to amuse her. Consequently, he doesn't make any more attempts from "Split Personalities" through at least "Doomsday Clock".
    • Ricardo and Riya share some likes and dislikes, but he doesn't help her with her personal problems, and his high chances of moving out of Charter Citynote  would complicate a romance.
    • Nathan never expresses a romantic interest in Riya, since he learns before the show begins that Jake already has a crush on her.
  • Dark Is Not Evil: Often shown wearing black clothing, including her school necktie and fingerless gloves, and is also the first of the main kids to take a stand against Rook.
  • Defrosting Ice Queen: She gradually opens up to Ricardo and his friends, especially after they prove their worth as partners in her fight against Stretch Monster.
  • Foil: In season one, she serves as a mild version of this for Jake. They both have difficulty juggling their schedules, and they both have secret identities they cannot discuss causing them additional stress. However, while Jake is friendly, if not awkward, and genuinely enjoys school, Riya is aloof and doesn't seem to care for most school activities.
  • Forgotten First Meeting: The Cold Open of "Riya's Revenge" shows her meeting Jake and Nathan as children, when the boys helped her find a missing baseball.
  • Girls Are Really Scared of Horror Movies: Averted; she loves the Zombies Walk Among Us movies, especially the second one.
  • Jerk with a Heart of Gold: She is rather cynical and snarky, but is still a good person on the whole. This is best shown when she's Blindstrike. She's definitely headstrong and stubborn on what she wants to do, but she ultimately just wants to stop Rook's corruption.
  • Likes Clark Kent, Hates Superman: In season one, Riya finds Stretch overhyped, but likes Jake enough to accept his invitation to the dance. After the Flex Fighters learn that Blindstrike was Riya in disguise, it seems hard to blame her for hating Stretch, seeing how he kept getting in the way of her mission; Riya also later reveals that the Flex Fighters unknowingly worked for the man who killed her parents. After the Flex Fighters and Blindstrike start teaming up against Rook, Riya and Jake and Ricardo learn to like both sides of each other.
  • Little Black Dress: She wears one to the school dance.
  • Meaningful Name: "Riya" translates to "graceful" in Hindu, and she doesn't seem very clumsy.
  • Not So Stoic: Nathan admits in the first season finale that he's rarely seen Riya smile, but this doesn't mean that the cartoon never shows her grinning. As a sadder example, she looks even glummer than usual whenever the topic of Rook killing her parents comes up.
  • Punch a Wall: In "Doomsday Clock", she punches a dent into an Academy wall when Jake cures her of the Tech Men's brainwashing.
  • The Reveal: Is subject to four.
    • "Endgame": She's Blindstrike, the ninja who's been opposing the main characters since the third episode.
    • "The Age of Flexarium": She's not actually a bad guy. By this point, she also either discovers or deducts Stretch's true identity, and lets him know by calling him, "Jake".
    • "The New Normal": By accidentally spreading the chemical agent of Hyper-Flexarium to her classmates, she helped turn Jake and his friends into the Flex Fighters.
  • Secret Identity: Blindstrike is hers.
  • Skipping School: Riya admits to Jake that she constantly skips Leadership Class. No one noticed because Dr. C created a holographic Riya to attend in her place.
    Jake: Because you were on missions for Dr. C?
    Riya: Uh... yeah.
  • That Makes Me Feel Angry: Riya yells, "I am angry!" in "Doomsday Clock", after Jake sprays her with some ceptio-arcide, freeing her from mind control and upsetting her to the point where she attempts to punch him. Evidently, the Tech Men's command for her to always speak her mind wears off more slowly than does their command never to feel or do anything negative.
  • [Verb] This!: Pulls this on Ricardo in "Endgame", after he appears to let basketball practice distract him from helping her deal with some stress (he actually had to vent after getting tricked by Stretch Monster in the previous episode):
    Ricardo: Riya, be cool! I'm dealing with some stuff!
    (Riya walks away, but not before scoring a basket one-handed, facing away from the hoop and Ricardo)
    Riya: Deal with that!
  • You Gotta Have Blue Hair: It's bright purple. When she was younger, though, it was dark brown.

     Erika Violette (pre-"Split Personalities" Tropes)

Voiced by: (English) Felicia Day

Another new student, introduced as Nathan's love interest.

  • Almost Kiss: Erika and Nathan have one in "Dr. Dreamscape", which Nathan interrupts when he realizes she's not the real Erika, just a vision in his dream.
  • Badass Normal: Playing field hockey has toughened her up to the extent that she can wreck an evil robot without anyone else's help.
  • Cat Girl: The Kindhearted Cat Lover dresses as one when hosting her after-school "cat circus".
  • Foil: Riya's first female classmate to join her in protecting Charter City from Rook has a more sociable and cheery demeanor than Riya does.
  • In the Hood: She wears a dark cloak when spying on the Flex Fighters, hiding her face until Riya notices her.
  • Locked Out of the Loop: Nathan, Jake, and Ricardo are all Flex Fighters. Riya is Blindstrike. In season 1, Erika remains unaware of all this.
  • Love Interest: Serves as this for Nathan. After the events of the school dance she attends with Gabe, the feeling is mutual.
  • Meganekko: Has thick glasses, and is still considered very attractive by multiple characters.
  • Nice Girl: She's usually very polite. For example, she lets Nathan down gently when it turns out she already has a date to the dance.
  • New Transfer Student: She fills this role.
  • Second Episode Introduction: She transfers to the Academy after the pilot, in episode three ("Ninja and the Ghost").
  • Secret Keeper: Season 2 entrusts Erika with a lot of confidential information.note 
  • Significant Green-Eyed Redhead: She has green eyes and red hair, and proves significant to the show after falling in love with Nathan.
  • Single Woman Seeks Good Man: After going out with Gabe, she finds him obnoxious and conceited. She immediately starts spending more time with Nathan.
  • Stealth Expert: When she stalks the Flex Fighters during a search for Riya/Blindstrike, her targets don't notice her until Riya asks the guys how they failed to notice "an untrained high-schooler" following them all the way to her parents' lab.
  • Strange Minds Think Alike:
    • When Nathan and Erika first meet in the hallway, they just silently smile at each other. Nathan boasts to his friends that the new girl "talked" to him, but since neither of them said anything, the friends doubt that it counts. However, when Ricardo and Nathan give Erika a tour of the school, she recognizes Nathan as the guy she "talked" with earlier. Nathan reminds her that they just smiled, but she assures him, "Well, that counts."
    • At the dance, Nathan and Erika discover that they both have the same "secret thinking spot" on campus; they don't realize it earlier because they usually visit the spot at two separate times.
  • Stunned Silence:
    • "Stretchipedes" cuts to Erika expressing this after Nathan boasts during biology class that he could make a great leader for Jake and Ricardo.
    • Erika's reaction in "Dr. Dreamscape" when Nathan reveals himself as Wingspan to her. In his dream, she experiences stunned amazement with him moonlighting as a superhero, until she praises his deeds. The real Erika instead experiences stunned horror with him moonlighting as an outlaw, until she chastises his crimes. In both cases, Nathan mistakes her silence for a struggle to remember who exactly Wingspan is.
  • Treehouse of Fun: Episode #20 begins with her painting in one (presumably built earlier than "Split Personalities").


     Gabe Bannerman 
Voiced by: (English) Josh Keaton

A classmate of Jake, Nathan, and Ricardo. A very dramatic drama geek who frequently tries in vain to win Erika's heart.

  • Camp Straight: Gabe acts very effeminate, but also flirts with every girl in sight.
  • The Casanova: Gabe is very interested in his female classmates, and judging by how many of them happily take selfies with him at the dance, the feeling's mutual.
  • Drama Club: He's very proud of being a member.
  • The Dandy: He's in theater, is extremely melodramatic, and clearly loves himself. A lot.
  • It Is Pronounced "Tro-PAY": Calls emo music "eh-mo" music, much to Erika's chagrin.
  • It's All About Me: He attends a dance with Erika, flirts with every girl in sight, shows off his own dance moves instead of dancing with her, then has the gall to be angry at Nathan for being genuinely interested in Erika and "stealing her" from him.
  • Large Ham: Just listen to him when he tries to intimidate Nathan.
  • Love Makes You Crazy: At a Rook Unlimited gala, Gabe hastily schemes to take Erika back from Nathan, by shooting him with a paint gun. This futile-seeming plan becomes even more reckless, when he accidentally grabs a gun with acidic ammo. Erika continues to resist the "stupid" Gabe, as she and Nathan wrestle the weapon out of his hands.
  • Never My Fault: Has a grudge against Nathan for "stealing" his date, Erika. She walked away from him because he was showing off around the other female students and ignoring her.
  • Red Herring: His stage combat skills and bullying behavior make him a suspect for Blindstrike's true identity, but not the right one.

Voiced by: (English) Josh Keaton

A classmate of Jake, Nathan, and Ricardo.

  • Jerk Jock: Pretty much all of his dialogue in "Ghost and the Ninja" consists of picking on Nathan, who failed baseball tryouts.
  • Red Herring: His physical strength and bullying behavior make him a suspect for Blindstrike's true identity, but not the right one.

Voiced by: (English) Eric Bauza

A classmate of Jake, Nathan, and Ricardo.

  • Badass Normal: Despite being nothing more than your average high school student, he still took down two heavily armored robots with little to no effort.
  • The Bully: Harasses students for basically no real reason.
  • Hair-Trigger Temper: Lashes out at people for the smallest of things.
  • Red Herring: His physical strength and bullying behavior make him a suspect for Blindstrike's true identity, but not the right one.

Voiced by: (English) Ogie Banks

A classmate of Jake, Nathan, and Ricardo.

  • Jerkass: Messes with others and mocks Nathan for essentially no real reason.
  • Nerdy Bully: He uses his smarts to pick on other students, subverting Ricardo's expectations of the academy's cliques.
  • Red Herring: His technical knowledge and bullying behavior make him a suspect for Blindstrike's true identity, but not the right one.
  • The Smart Guy: Stands out from the crowds of students due to his technical know-how.

     Principal Lewis Wilson 
Voiced by: (English) Tom Kenny

The principal of the school.

  • Reasonable Authority Figure: As strict as he is, he is just looking out for his students.
  • Red Herring: His strictness makes him a suspect for Blindstrike's true identity, but not the right one.
  • Small Role, Big Impact: He only appeared in the pilot episode for a few minutes, but his asking Jake to show Ricardo around is the catalyst to their eventual friendship.

     Mr. Oleg Savic

Voiced by: (English) Walter Koenig

The botany teacher.

  • A Day in the Limelight: Usually a minor character, he is given a much bigger role and some insight into his life in "Biomass".
  • Adorkable: Even though he's a full grown adult, he still feels the need to make some cheesy botany jokes. He's still cool regardless.
  • Badass Teacher: He saves a student from a robot attack by tearing apart its wires. In season two, he also demonstrates some surprisingly high physical strength as a side effect of his transformations into Biomass.
  • Companion Cube: In between losing his wife and daughter, and becoming friends with Grandpa Park (who admires Savic's achievements in biology), his only company at home includes his uniquely-named houseplants, only one of which talks back to him.
  • Outliving One's Offspring: He lost his wife and daughter. He clearly misses them, to the point he created Anastasia.
  • Pungeon Master: He often spouts plant-based puns.
  • Red Herring: is scientific knowledge makes him a suspect for Blindstrike's true identity, but not the right one. Wingspan even lampshades the inaccuracy of this guess after Blindstrike's unmasking.
  • Smart People Play Chess: He does this with both Anastasia and Grandpa Park.
  • Superpowered Evil Side: Biomass, though he soon gets over it.

All spoilers up to the second season finale will go un-marked in the below folder!

     Erika Violette (post-"Split Personalities" Tropes) 
Voiced by: (English) Felicia Day
When Erika accompanies the Flex Fighters and Riya on an undercover infiltration of Rook Unlimited, an exposure to Flexarium grants her the powers to release EMPs and float.

  • Action Girlfriend: When Gabe threatens to shoot Nathan with a Flexarium gun, Erika quickly pushes the nozzle away from Nathan, before both of them wrestle the gun out of Gabe's hands. Erika also demonstrates impressive self-defense and espionage skills in earlier episodes, which combined with her new powers give her real potential to join Wingspan on the battlefield (especially since he wouldn't have to take to the skies alone).
  • Affirmative Action Girl: Erika discovering the Flex Fighters' and Blindstrike's Secret Identities, then getting her own powers, seem to build up to her fighting alongside the Flex Fighters and Blindstrike in season three. Even before it starts, the season two finale's end credits show her floating next to her teammates.note 
  • Came Back Strong: Erika's body takes quite a while to adjust to her new abilities, to the extent that she becomes comatose. After Stretch wakes her up, she unleashes an energy pulse so strong, it disables the Tech Men's brainwashing frequency.
  • Cursed With Awesome: When Stretch visits the comatose Erika's dream, she asks him if the stress of a vigilante life makes him wish he never got powers, but he denies it, giving her the courage to demonstrate hers.
  • Deus ex Machina: It takes until the last episode of season 2 for the guys to discover that Erika has the potential to save Charter City from the Tech Men, via Rook's explanation of exactly what kind of Flexarium contaminated her.
  • Empowered Badass Normal: Erika becomes one after the aforementioned contamination.
  • Glowing Eyes: Erika demonstrates these at the end of "Split Personalities", after Ricardo delivers the episode's final spoken line.
    Ricardo: The only thing that's constant in this world is change.
  • Heroic Sacrifice: Subverted; Stretch warns her that she might not survive disabling the Tech Men's frequency, but she agrees to do so, anyway. Floating while she releases the pulse, she falls towards the ground afterwards, but Wingspan catches her.
  • Power Glows: Her body glows when she creates especially strong pulses.
  • Power Palms: During the aftermath of the Tech Men's downfall, Erika demonstrates to Nathan that she can release smaller EMPs from her hands.
  • Strange Minds Think Alike: She and Wingspan have similar reactions to Stretch visiting their dreams, and pep-talking them into defeating the latest villain after waking; emphasized by Erika telling hers to Wingspan (the first person she sees after waking) instead of Stretch.
    "This has been a really weird day."
  • Walking Spoiler: Discussing Erika's superheroine identity would spoil a lot about her life after transferring to the Academy. Viewers who know nothing about Erika's and Nathan's romance might even consider her a Late-Arrival Spoiler.

Rook's Biggest Rivals


Voiced by: (English) Nazneen Contractor

Riya Dashti's vigilante alter ego, a mysterious, ninja-like individual who has repeatedly broken into Rook Unlimited by the start of the series. She starts out as an enemy of the Flex Fighters, until they team up to save Charter City from an Evil All Along Rook/Stretch Monster.

  • Action Girl: The first female crimefighter to team up with the Flex Fighters, though she began her efforts to expose Rook before the show started.
  • Badass Normal: Blindstrike keeps up with the Flex Fighters easily, despite having no superpowers.
  • Beauty Is Never Tarnished: Riya never appears to have helmet hair after removing her mask.
  • Celibate Hero: Overthrowing Rook doesn't leave her with much time for dating.
  • Color-Coded Characters: Blindstrike has turquoise-colored weapons and armor streaks, while Riya wears turquoise either as her school uniform, or underneath her casual outfits.
  • Create Your Own Villain: In the second season premiere, Riya claims credit to an incident that felt like this from her perspective.note 
  • Cyber Ninja: Blindstrike's basic fighting style.
  • Dark Is Not Evil: She wears dark grey armor, but has sworn to save Charter City from Rook's evil schemes.
  • Dispense with the Pleasantries: When Blindstrike has to lead the Flex Fighters through the sewer, she dismisses Stretch's awkward attempt at flattery; he assures her that she smells "wonderful" even after trudging through sewage, but she interrupts his description of her scent with a Disapproving Look.
  • Dramatic Unmask: "Endgame" reveals Riya as Blindstrike after Stretch Monster extracts some prolitite from her armor, cracking the suit apart. Only the Flex Fighters see Blindstrike's face in that episode; her mask gets repaired before Stretch Monster can also see it.
  • Dream Walker: A combination of her Knockout Gas, her comm link, and an electric pulse can send her and/or her teammates into someone else's dream.
  • Dual Wielding: Blindstrike wields with both hands, using a number of different weapons.
  • Expy: Of G.I. Joe's Snake Eyes.
  • Failure Is the Only Option: Blindstrike can never hold on to evidence of Stretch Monster's true identity, a misfortune that feels especially egregious starting in season two.
  • Foreshadowing: In season one, Riya likes Jake, but hates Stretch, and doesn't appear among the classmates once the final conflict in "Crisis at the Cleo" starts. Even more notably, the scene before her secret identity is revealed, she talks to Jake about struggling to balance school and other demanding activities, similar to how he's struggled with school and keeping his secret identity. In addition, when the Flex Fighters are trying to discover which of their classmates is Blindstrike, they never bring up the possibility that Blindstrike could be a girl, probably due to the fact that Riya would become a much more obvious candidate.
  • Good All Along: Despite opposing the Flex Fighters for almost all of the first season, it turns out she's working with Dr. C to expose Jonathan Rook's evil schemes.
  • I Work Alone: The season two premiere shows Riya taking a while to adjust to having the Flex Fighters as unlikely allies for new missions.
  • Late-Arrival Spoiler: After the Flex Fighters discovered Blindstrike's true identity, the promos for the show stopped hiding it, or her forming an alliance with them. Additionally, Blindstrike's figurenote  has a removable faceplate, but the instructions don't show how to take it off, or how she looks without it.
  • Made of Phlebotinum: Uses armor and weapons made of Flexarium.
  • Le Parkour: Has traveled by rooftop, and uses great acrobatic skills to get past a laser security system at one point.
  • Origins Episode: Episode #16note  explains how Riya became Blindstrike.
  • Pet the Dog: In "Crisis at the Cleo", Blindstrike shields some Academy students from a Tech Man's blades, a sight that doesn't look so surprising when Stretch suggests that Blindstrike made it inside to the museum because "he" either attends (correct) or works for the Academy.
  • The Quiet One: Blindstrike rarely speaks while on missions, and only to allies. In fact, the Flex Fighters and the viewers never hear Blindstrike say anything until the episode following the one in which the guys discover her real identity; the scene in which Riya first speaks to the Flex Fighters as Blindstrike occurs off of the battlefield.
  • Samus Is a Girl: Some of her enemies (including the Flex Fighters, until her Dramatic Unmask) mistake her for a man.
  • Second Episode Introduction: Riya appears in the pilot, but the third episode, "Ninja and the Ghost", marks the first time the Flex Fighters encounter her as Blindstrike.
  • Seen It All: The less glamorous parts of carrying out Dr. C's missions, such as trudging through the sewer, don't faze Blindstrike as easily as they do the doctor's later recruits.
  • Suddenly Speaking: Blindstrike finally starts talking to Stretch in "The Age of Flexarium", after Dr. C finishes curing him and his team of Rook's poisoning, and before she removes her mask to explain hers and Cleo's motivations.
  • The Team Normal: The only one among Stretch's teammates not to have any superpowers, save the period in between Erika starting to join in Flex Fighter meetings and missions, and Erika developing her own powers.
  • Villainous Rescue: Before Dr. C recruits the Flex Fighters, Blindstrike saves them from getting poisoned by Stretch Monster in "The Age of Flexarium", and from getting captured by him in all but one of "The Breakout"'s endings.
  • You Killed My Father: Dr. C trained Riya to become Blindstrike to help carry out revenge against Rook for the death of Riya's parents.

     Dr. Racine "Dr. C" Cleo

Voiced by: (English) Kate Mulgrew

Rook Unlimited's former top scientist. Originally believed to be dead, it's eventually revealed she's alive, and Blindstrike's commander. After the Flex Fighters destroy Stretch Monster's Flexarium army, she recruits the young men to help her foil more of Rook's evil plans.

  • Back from the Dead: She was believed by Rook Unlimited to be dead, until the Flex Fighters connect her with Blindstrike.
  • Badass Bookworm: One flashback in season two shows Dr. C shooting Stretch Monster with a tranquilizer gun.
  • Badass Teacher: Another flashback in season two shows Dr. C teaching Riya ninjutsu.
  • Big Good: After Rook's true goals are revealed, the Flex Fighters take orders from her, instead.
  • Breaking the Fourth Wall: She communicates to the viewers at the beginning of "The Breakout", instructing them how to select each direction. After the villains' re-capture, she also takes the viewers back to one of the branching points, in case they'd want to see a different scenario.
  • Cool Plane: She and Blindstrike have an airplane that can turn invisible.
  • Eye Scream: She started wearing an eyepiece after Rook first became Stretch Monster, and went on a rampage in the laboratory, splashing some Flexarium on her right eye.
  • Good All Along: The Flex Fighters initially suspect her of leading all the Flexarium-powered antagonists, including Stretch Monster. Instead, it turns out she's been trying for years to expose Rook's criminal activities.
  • Hoist by His Own Petard: When circumstances late in season two require Dr. C to team up with Rook, she makes him wear a Shock Collar, to keep him in line. By the finale, Rook has rigged the collar's remote to gas Dr. C into a coma.
  • Home Base: When the show begins, she has her own Hacker Cave in an abandoned building. After "Secret Ninja Party", she relocates to an Elaborate Underground Base.
  • Jerk with a Heart of Gold: She maintains a rather cynical personality, but she does soften up to the Flex Fighters when they ally with each other. Considering she's trying to take down Rook, (aka Stretch Monster), and helping Riya avenge her parents, she's not all bad.
  • Knockout Ambush: "Doomsday Clock" has her on the receiving end when Rook gasses her.
  • Mission Control: She gives the orders, and leaves the physical side of things up to Blindstrike (and the Flex Fighters, starting in either "The Breakout" or "The New Normal").
  • The Needs of the Many: The season two premiere reveals her to have taught Blindstrike that preventing casualties on missions would only distract from their main goal of freeing everyone in Charter City from Rook/Stretch Monster; their Character Development involves learning to care more about the safety of Innocent Bystanders.note 
  • Never Mess with Granny: Dr. C demonstrates in the season two finale that she can still hold her own in battle. The Tech Men take a surprisingly long time to knock out the sword-wielding, karate-fighting doctor.
  • Parental Substitute: Riya regards her as a replacement for her murdered mother. Dr. C even expresses Adult Fear when Blindstrike gets ambushed in "Secret Ninja Party".
  • Power Nullifier: She tries to drain the Flex Fighters' powers, claiming that without them, Rook can't boss the boys around. Removing their powers would've also made it harder for Rook to collect enough data to create a Flexarium army.
  • Promoted to Opening Titles: As of "The Breakout", Dr. C and Blindstrike (who already appeared in the opening as Riya) have replaced Rook and Kane in the intro.
  • Save the Villain: "Secret Ninja Party" subverts this; when Stretch Monster flings Dr. C out of her lair, Stretch tries to catch her, but can't reach her. Instead, Dr. C lands in a rooftop swimming pool.
  • Second Episode Introduction: The Flex Fighters meet her after the pilot, in the third episode ("Ninja and the Ghost").
  • Skunk Stripe: Has a streak of gray hair near her bangs.
  • Smart People Wear Glasses: She often has spectacles in flashbacks.
  • The Spark of Genius: She created hyper-flexarium, something even Rook can't seem to replicate.


     Stretch Monster 
Voiced by: (English) David Kaye and Miguel Ferrer

Jonathan Rook's Superpowered Evil Side, a monstrous creature who has the same Rubber Man abilities as Jake. He has been providing citizens of Central City with a compound that gives them superpowers, effectively transforming them into supervillains.

  • Arch-Enemy: Shapes up to be this for the Flex Fighters, especially after he frames them.
  • Blatant Lies: He lies to the Flex Fighters that he's been forced to work for Dr. C so that they'd lead him to her.
  • Big Bad: Is built up to be this in the first season, though the main characters aren't aware of his existence at first.
  • Big Bad Ensemble: He and the Tech Men are the main threats of Season 2.
  • Create Your Own Hero: Stretch Monster killing Drs. Aadarsh and Isha Dashti motivated their daughter, Riya, to avenge them as Blindstrike.
  • The Dreaded: The other criminals of Charter City are too afraid to turn on him.
  • Did You Actually Believe...?: "Did you really believe the world's most powerful tech company wanted a group of untrained teenagers to be corporate superheroes? Even Kane has no idea what's really going on. Everything he said about you is true: you're no heroes, you're jokes."
  • Disc-One Final Boss: For Season 2. He is usurped from his status as Big Bad mid-season by Kane and the Tech Men.
  • Evil Sounds Deep: Both of his voice actors give him a deep and intimidating voice.
  • Eviler Than Thou: Is on the receiving end of this from Kane and the Tech Men in Season 2.
  • Evilutionary Biologist: Stretch Monster AKA Jonathan Rook's overall goal is mutate all of humanity with his abilities with the help of his Flexarium Army.
  • Exactly What It Says on the Tin: His name is Stretch Monster. He's a monster who can stretch.
  • Fish People: Definitely looks like one, and functions just fine underwater.
  • Foreshadowing: The twist in the episode "The Age of Flexarium" was foreshadowed in previous episodes:
    • "Online Presence": Stretch Monster not only knew about Rook's satellite, but when the news announced that Rook Unlimited would be in charge of security, he states that it was according to plan.
    • "Stretchipedes": Stretch Monster somehow knowing how to reprogram the Stretchipedes shows he somehow knew how they operate. Furthermore, Rook is the one who coins the name "Stretch Monster".
    • "Crisis At The Cleo": Rook is outright hostile to the museum security for losing the same Prolotite meteorite Stretch Monster failed to steal.
    • "Endgame": Stretch Monster somehow knew Blindstrike converted the Prolotite into armor the same time Rook did.
    • And in "The Age of Flexarium" itself: Rook repeats a line that Stretch Monster used, that people "rarely know what's best for them". Also, the only time Stretch Monster appears on the monitor as the other villains is when Rook is standing in front of it.
  • Karma Houdini: Despite some setbacks, he pretty much gets what he wants in the long run with no lasting consequences.
  • Knight of Cerebus: There's very little comedy coming from him.
  • The Man Behind the Man: He's been giving criminals in Charter City powers and weapons that make them a match for the Flex Fighters.
  • Nonindicative Name: Stretch Monster's figure throws boulders, but can't stretch, unlike the pre-Flex Fighters monsters.
  • Nothing Personal: How he regards what he does to the Flex Fighters. They call him out on it.
  • Not So Different: Has a moment like this with Jake when discussing their similar powers. Too bad he ruins it by stabbing Jake in the back again.
  • Origins Episode: Episode #21note  details the circumstances that turned Stretch Monster into a Flexarium beast.
  • Red Eyes, Take Warning: His red eyes seem capable of glowing in the dark, adding to his monstrous appearance. The first thing about Rook that changes is his eyes turning red.
  • Rubber Man: He isn't called Stretch Monster for nothing.
  • Save the Villain: After the Tech Men usurp Rook, and trap him in a half-human, half-monster state, Wingspan and Omni-Mass bring him to Dr. C.
  • Secondary Color Nemesis: He's predominantly green, a duller green than Wingspan.
  • Second Episode Introduction: The end of the second episode, "Pulled in Every Direction", marks his first appearance, discounting all of Rook's appearances beforehand.
  • Secret Identity: Jonathan Rook is his.
  • Transhuman Treachery: Stretch Monster's Motive Rant in "The Age of Flexarium" reeks of his disdain for humanity as it is.
  • Voluntary Shape Shifting: Between Rook and Stretch Monster.
  • Xanatos Gambit: Season one is about him creating an army made of living Flexarium, and his plans are laid out so no matter what happens, he wins.

     Dr. Don Robertson/Multi-Farious 
Voiced by: (English) Jon Heder

A disgruntled scientist from Rook Unlimited who, after being exposed to Flexarium, becomes the monster that the news dubbed "Multi-Farious".

  • Enemy Mine: One of the scenarios in "The Breakout", which does occur in the non-interactive version, pits the Flex Fighters and Multi-Farious against Stretch Monster, as revenge for the latter's unethical experiments.
  • Humanity Ensues: One ending of "The Breakout" has an experimental serum from Stretch Monster reverse his transformation. The non-interactive version, shown on devices unable to let viewers choose each outcome, has this reversion take place somewhere in the middle of the story.
  • I Warned You: Multi-Farious' unfazed reaction after Wingspan informs him that Rook is also Stretch Monster.
    Huh. It figures... I always told you that he was a bad guy!
  • Me's a Crowd: His body can split apart, with each piece having a mind of its own.
  • Not Me This Time: He's one of the few season one criminals who isn't connected in any way to Stretch Monster, hence why he isn't afraid of him.
  • Put on a Bus: "The Breakout" essentially writes him out for season two, whether he is cured, killed, or imprisoned back on Rook Tower.
  • Revenge Before Reason: His Enemy Mine with the Flex Fighters eventually puts him in a situation where he must decide whether to destroy Stretch Monster, or heed Stretch's warning that If You Kill Him, You Will Be Just Like Him. Choose the former, and Stretch Monster crumbles Multi-Farious with a lethal version of a Flexarium cure. Choose the latter (as the non-interactive version automatically does), and Multi-Farious manages to avoid Stretch Monster's attack, then proceed to literally regain his humanity.
  • Starter Villain: The first villain the Flex Fighters battle.
  • We Used to Be Friends: Based on what Rook says, the two used to be closer. Currently, Robertson has a grudge against Rook for overworking him.

Voiced by: (English) James Arnold Taylor

A hacker who frequently targets Rook Unlimited. Thanks to Stretch Monster, he's able to do more.

  • Brainy Brunette: He has dark hair before his transformation frizzles it and turns it green.
  • The Cracker: After getting his powers, he starts causing chaos throughout Charter City.
  • Foreshadowing: Graffiti art of his insignia can be seen in the alley Jake and his friends run into right after getting their powers, showing that he's been active for far longer before the trio became superheroes.
  • Intangibility: One of the advantages of being able to turn into electrical energy is passing through solid matter.
  • Morality Pet: Has a pet gecko named Brutus that he actually takes care of.
  • Power Dyes Your Hair: Once he receives his powers, his hair turns green and becomes more wire-like.
  • Power Echoes: Gaining powers also modifies his voice to have an echo and sound more electronic.
  • Smart People Wear Glasses: Wears glasses and is a hacker smart enough to make trouble to Rook, even if he's initially unsuccessful at it.
  • Villain Has a Point: He's causing a lot of havoc on Charter City, but he does make a justified point at how wrong it is Rook's satellite can invade other people's privacy through surveillance.
  • Technopath: Thanks to Stretch Monster, he can hijack machines with just a touch.

     Kari and Mari/The Freak Sisters 
Voiced by: (English) Grey DeLisle

A twin duo of criminals with tech provided by Stretch Monster.

  • Always Identical Twins: The two barely look different from each other.
  • Flat Character: Aside from being thieves who got lucky thanks to Stretch Monster, they have little personality and are swiftly defeated in both "Stretchipedes" and "The Breakout".
  • Graceful Loser: Mari takes getting captured by Blindstrike in stride, admitting that she and her sister didn't have anything else planned after attempting to rob the bank.
  • Identical Twin ID Tag: Kari dresses in pastel colors, while Mari wears dark colors.
  • Perky Goth: Despite being dressed like a goth, Mari is just as giddy as Kari.
  • Prehensile Hair: They use the hair-like appendages on their helmets to move and attack.
  • Theme Twin Naming: Kari and Mari have names that rhyme.
  • Villainous Harlequin: Stretch Monster's flashback of recruiting them implies that they used to work for the circus, which would explain their garish fashion, and the ferris wheel setting of their first fight against the Flex Fighters.
  • You Gotta Have Blue Hair: The Flexarium "hair" is blue. In the flashback of Stretch Monster recruiting the Freak Sisters, Kari has pink hair, and Mari has purple hair.

     Jack Kinland/Smokestack 
Voiced by: (English) Clancy Brown

The former leader of the Made Men and a powerful crime lord active even before Rook rebuilt Charter City. He becomes desperate enough to reclaim his position to make a deal with Stretch Monster and become the supervillain Smokestack.

  • Badass in a Nice Suit: Smokestack gets himself a pinstripe suit tailor made for his new size and appearance. In "The Breakout", he also has a disco-styled suit when invading Madam Tousant's nightclub.
  • Evil Mentor: To Kane, before he left behind his criminal career.
  • Evil Old Folks: He was around in Charter City long before Rook renovated it and was a father figure to Kane and Mickey Simmons.
  • Evil Sounds Deep: As per usual with many of Clancy Brown's characters, he has a deep and intimidating voice.
  • The Don: Smokestack was the boss of the underworld prior to the 1st episode and his goal is to reclaim that position with his new powers.
  • Super Smoke: Fitting to his nickname, he can turn himself into smoke and become intangible.

     Mickey Simmons 
Voiced by: (English) Henry Rollins

The leader of The Stick Shifts, one of the criminal gangs that rule over the Old Town section of Charter City.

  • A Father to His Men: Implied. In "The New Normal", the Stick Shifts terrorize Old Town and demand that Simmons is released from prison. This strong loyalty contrasts Mr. Silver, who quickly seized power of the Made Men when Smokestack went to jail.
  • Affably Evil: Despite being a gangster, that doesn't change the fact he's surprisingly friendly, even while trying to break your head in.
  • Evil Former Friend: To Kane. Though as of episode #20, Kane, the leader of the Tech Men, may be far worse than Simmons.
  • Spiky Hair: He has spiky grey hair.
  • Tattooed Crook: He has a blue tattoo over his right eye.
  • Wounded Gazelle Gambit: He approaches Kane all bandaged up to convince him to team up against Smokestack. However, once Kane finds out he was actually working with Smokestack, he removes the bandages to reveal no injuries.

     Madam Tousant 
Voiced by: (English) Vanessa Marshall

The leader of The Sables, one of the criminal gangs that rule over the Old Town section of Charter City.

Voiced by: (English) Eric Bauza

The leader of The Daggers, one of the criminal gangs that rule the Old Town section of Charter City.

  • Even Evil Has Standards: Though a villain, even he can't stand how immoral Smokestack is.
  • Fighting with Chucks: Occasionally his gang members are seen using these during fights.
  • Filler Villain: Hold very little importance to the narrative as a whole, up until trying to rob Dr.C's safe house at least.
  • Heroes Prefer Swords: Inverted, as he's a villain and his gang are some of the only people to actually use any kind of bladed weaponry, outside of Blindstrike.
  • Highly Visible Ninja: Him and his gang don't exactly try to stay hidden in a fight.
  • Japanese Politeness: The most polite and calm of the three gang leaders, and his gang overall has a Japanese motif(specifically ninjas).
  • Katanas Are Just Better: Seems to favor bladed weapons over anything else, specifically katanas.
  • Technicolor Ninjas: Wears primarily blue and red suits, which you certainly don't expect a gangster to do.

     Dr. Sarah Kamen/Quick Charge 
Voiced by: (English) Yvette Nicole Brown

The founder of Harkness General Energy. After Rook Unlimited puts her energy company and her work out of business, she gains electric powers and super speed, and seeks revenge against Rook.

  • Advertised Extra: Despite only making a few appearances, she became one of the first three antagonists (along with Stretch Monster and Blindstrike) to get an action figure, possibly to give the toyline someone who always looks feminine.note 
  • Flash Step: She uses it in "The Breakout" to avoid the heroes' attacks.
  • Psycho Electro: She has electric powers and revels too much in the destruction she causes.
  • Nothing Personal: In "The Breakout", she claims she has nothing against the Flex Fighters, but she is fighting them because Stretch Monster promised her to gain back what she lost from Rook.
  • Shock and Awe: Particularly in her first appearance.
  • Skunk Stripe: She has a big, pink streak.
  • Super Speed: In addition to controlling electricity, she can skate out of trouble at a fast pace.

     Extreme Hazard Unit 
Voiced by: N/A

A government agency led by Agent Rathjani. Operating outside of Charter City, it cleans up and eliminates any hazardous materials, which pits them against the Flex Fighters when they want to save the Mantoid.

  • Anti-Villain: They want to kill the Mantoid and have no qualms about fighting teenagers, but they also believe the creature is dangerous and they do have jurisdiction over it, not Rook.
  • Child Hater: Agent Rathjani demeans the Flex Fighters for just being teenagers.
  • Cleanup Crew: Their job is to clean up after incidents, such as the one that created the Mantoid and her kids.
  • Hazmat Suit: Everyone but Rathjani wears yellow hazmat suits.
  • Sinister Shades: Agent Rathjani wears these.
  • Tactical Withdrawal: After Rook annexes the territory their base is located in, Rathjani orders everyone to stop the battle with the Flex Fighters and leave the area to avoid a fight with Rook's forces.

     Tech Men 
Voiced by: (English) Luke Arnold (Number Six), Scott Menville (Number Fifty-Three/Number Twenty-Eight), Steven Yeun (Number Sixty-Six), Ogie Banks (Number Forty-One/Number Fifty-Four), Wil Wheaton (Number Thirty-Nine), Will Friedle (Number Ninety-Seven/Number Thirty-Four/Number Forty-Four/Number Seventy-Four), Ian Hopps (Number Twenty-Four), Keith David (Number One)

An organization of rogue scientists who attempt to use the latest technology to control society.

  • Ascended Extra: They started out as some nameless baddies that Stretch fought in a short demonstrating his powers to the storyboard artists.note  They moved on to Season 1 of the show, as seemingly another Villain of the Week. Then Season 2 has them put their master plan into action and become part of a Big Bad Ensemble with Stretch Monster.
  • Big Bad Ensemble: They, alongside Stretch Monster, are the biggest threat in season two.
  • Create Your Own Hero: A mole deserves some credit for a Tech Men plan going wrong.note 
  • Cult: They had many of the trappings of one when they were the Epsilon Society. Carried over when they became the more militant Tech Men.
  • Evil All Along: At first, Malcolm Kane appears to be Jonathan Rook's tough but fair head of security Rook Unlimited that care about Charter City and is in the dark about his boss true goals. Then season 2 revealed he was in fact the leader of the Tech-Men, Number One, and he knew about Rook's double life as Stretch Monster all along.
  • Evil Sounds Deep: Number One sounds deep both with and without his helmet.
  • The Evils of Free Will: The last episodes of season two see the Flex Fighters attempt to thwart the Tech Men's attempts to mind control everyone into forming a more peaceful Charter City.
  • Falsely Reformed Villain: It looks like Kane hasn't completely abandoned his gangster past.
  • Hidden in Plain Sight: The season two finale shows some Tech Men going to hide among civilians by discarding their uniforms, revealing more discreet outfits underneath.
  • Light Is Not Good: Number One primarily wears white clothes in his civilian identity.
  • Loss of Identity: The Tech Men require new members to abandon their names. Back when they were known as the Epsilon Society, this rule scared Rook away from joining them. Number One only becomes Malcolm Kane again in order to more easily infiltrate Rook Unlimited.
  • The Mole: Number One/Kane infiltrates Rook Unlimited to help the Tech Men hack into and steal that place's tech.
  • Running Both Sides: Number One is the leader of the Tech Men but runs Rook Unlimited's Delta Squad and general security as Malcolm Kane.
  • Visionary Villain: They want to reshape the world with adherence to rigid order and science.
  • You Are Number 6: All of the Tech Men have numbers instead of names.

     Flexarium Monster 
Voiced by: (English) Andrew Kishino and Will Friedle

Stretch Monster's first human test subject (discounting his human alter ego, Jonathan Rook) for Hyper-Flexarium experiments.

  • A Dog Named "Dog": He refers to his pet cat as, "Cat". When Cat rejects Ricardo's suggestions for a new name, he comments that the previous owner must not have been very creative.
  • Early-Bird Cameo: He is seen in the background among civilians in some episodes before his introduction, usually as a public transportation passenger.
  • Full-Body Disguise: He wears one when impersonating Officer Reynolds, after replacing an arrested Kane as Rook's Head of Security.
  • I'm Melting!: He drains into the sewer when the Flex Fighters disconnect him from Stretch Monster's console.
  • Mutants: Stretch Monster experiments on him because his "rare genetics" apparently increased his chance of surviving the failures. Regardless, he has an ordinary physical appearance before Stretch Monster successfully changes him.
  • No Name Given: The end credits simply refer to his human form as, "Man".
  • Not Quite Dead: He drains into the sewer in "Endgame", but turns up again at the end of "Doomsday Clock".
  • Secret Keeper: Implied that he knows Stretch Monster's human identity when he calls it "interesting" that the monster apparently outlived Dr. C and the Epsilon Society; Stretch Monster also confessed to him before the first experiment that he killed the Dashti scientists.
  • Shapeshifter: He can change his form to increase his attack and defense.

     Officer Santos/Mechanica 
Voiced by: (English) Tia Carrere

A Rook Unlimited employee, she was heavily injured during the Flex Fighters and Stretch Monster's battle in Rook Tower. Believing the Flex Fighters to be responsible for her injuries, she allows Rook to rebuild her as a vengeful cyborg.

  • Advertised Extra: Despite being featured on the promotional art for Season 2 and making a prominent appearance on the second season’s trailer, she only appears for two episodes.
  • Artificial Limbs: She lost her arms and legs, and were replaced with robotic new ones.
  • Designated Girl Fight: Each of her season two appearances places her in a duel with Blindstrike.
  • Early-Bird Cameo: She has a small speaking cameo in the very first episode of the series.
  • Eye Scream: She lost her eye during the Rook Tower attack, and had to get a replacement.
  • Hoist by His Own Petard: Blindstrike takes Mechanica's Stretchipede, and delivers it to Dr. C. Dr. C reprograms the bug to do her bidding, siccing it on Mechanica when Stretch and Blindstrike confront her en route to the doctor's lair. Since it takes seven episodes for the Stretchipede to re-appear, it also counts as a Chekhov's Gun.
  • Hypocrite: She believes (erroneously) that the Flex Fighters are villains and declares herself to be a new hero. However, when she has to run away from them during battle, she doesn't hesitate to collapse a bridge to endanger civilians and force them to abandon chasing her to save them.
  • Roaring Rampage of Revenge: She's still loyal to Rook, but other than that, she pursues reckless, violent revenge.
  • Swiss Army Appendage: Her arms can switch between a claw hand, a large blade, a whip, and a laser gun. She can also use the Stretchipedes for reinforcement.

     Jay Michaels/Dr. Dreamscape 
Voiced by: (English) Michael Ross

A low-level psychic, he enhanced his powers to be able to hypnotize people through their dreams. He seeks to continue his crime spree in Charter City.

  • Dream Land: The Dreamscape, which he controls and uses to manipulate people.
  • Dream Weaver: Able to manipulate the Dreamscape to control people.
  • Fashionable Asymmetry: Wears asymmetric shades.
  • From Nobody to Nightmare: According to Dr. C, he had weak psychic powers and stuck to petty crimes before escalating. Near the end of the episode, he manipulates Wingspan into hijacking a ship with nuclear weapons to hold Charter City hostage.
  • New-Age Retro Hippie: Dresses up as one.
  • Psychic Powers: He enhances them to be able to use the Dreamscape to manipulate others to pull off his crimes.
  • Reality Warper: In the Dreamscape, he can control the terrain and even change his own appearance.

     The Gentleman 
Voiced by: (English) Eric Bauza

A mercenary hired by Stretch Monster to capture Blindstrike. He sports a mechanized suit, as well as good manners.

  • Affably Evil: He treats his opponents as gentlemen even when he's trying to get rid of them.
  • Badass Mustache: A wizened, experience mercenary that sports one.
  • Cane Fu: His primary Weapon of Choice, which he uses during his fight against Blindstrike and the Flex Fighters.
  • Evil Old Folks: He has gray hair and acts like a veteran in his job.
  • Powered Armor: It gives him enhanced strength and agility.
  • Secret Keeper: One of the few people besides the heroes to discover Stretch Monster's true identity, and he hints to blackmail Rook about it in the future.
  • Spot of Tea: He takes the time to enjoy some tea right before fighting the Flex Fighters.
  • Wicked Cultured: He has the mannerisms of an aristocrat, uses words like “fracas”, and likes poetry.

Voiced by: (English) Tara Strong

A plant and AI hybrid created by Mr. Savic to keep him company. However, she has far more sinister goals.

     Multi-Farious II 
Voiced by: (English) Josh Keaton

During a Rook Unlimited gala, waiter Gabe makes a failed attack on Nathan (who attends the gala while on an undercover Flex Fighters mission), after which some Multi-Farious debris turns Gabe into "Gabe-Farious".

  • Asshole Victim: If Gabe abandoned his plan to "paint gun" Nathan, then the gun's acid wouldn't have dissolved the glass cover of the Multi-Farious debris, then the debris wouldn't have transformed Gabe.
  • Create Your Own Villain: Riya might have helped turn Gabe into Gabe-Farious when she accidentally exposed him to the chemical agent in Hyper-Flexarium.
  • Easy Amnesia: Gabe-Farious finds out that Nathan is one of the Flex Fighters, and seems impressed. However, upon turning back to Gabe, he loses his memory of what happened, and still plans to get back at Nathan.
  • Expecting Someone Taller: Ricardo inverts this when he quips that he expected Gabe's sensitive side to look smaller.
  • Harmless Villain: Gabe-Farious' misdeeds, such as insulting bystanders and popping a kid's balloon, seem pretty minor compared to most villains.
  • Hidden Depths: Gabe's "true" personality is revealed to be the considerate, sensible one, who always feels down about turning away Erika. He just hides it with his large ego and hammy mannerisms.
  • Laughably Evil: Some pieces of Gabe-Farious engage in silly shenanigans, such as giving Omni-Mass a Pie in the Face.
  • Legacy Character: To Multi-Farious.
  • Licked by the Dog: Erika assures the sensitive piece of Gabe-Farious that she doesn't hate him, since she knows that "Everyone has a sensitive side." This insight eventually helps Wingspan find the Gabe-Farious piece representing Gabe's true personality.
  • Literal Split Personality: Each piece of Gabe-Farious represents a different aspect of Gabe's personality.
  • Magic Pants: While the first Multi-Farious doesn't have any clothes when becoming human in "The Breakout", save a lab coat Stretch drapes over him, Gabe has boxers after changing back from Gabe-Farious.
  • Made of Explodium: Once the Flex Fighters obtain the cure for Gabe's transformation, they must give it to the piece representing his "true" personality, or else all the pieces will blow up the city.
  • Me's a Crowd: Like Multi-Farious, his body can split apart, with each piece having a mind of its own.
  • Rule of Three: It takes the Flex Fighters three tries to find Gabe's true personality.
  • Token Good Teammate: The sensitive piece asks for Nathan's help in contacting the Flex Fighters to stop the other pieces from wreaking havoc.

Family Members

     Mark Armstrong 
Voiced by: (English) Gary Cole

Jake's father. After the death of his wife, he became extremely involved in Jake's life, giving him a rigorous schedule to keep up with.

  • Control Freak: So much so that he considers Jake missing a few of his extracurriculars good incentive to ground him.
  • Freudian Excuse: He's far too controlling of his son, but it comes from a need to overcompensate since his wife passed away.
  • Good Parents: Despite his extreme overprotectiveness, and the rigorous schedule he keeps Jake on, Mark only wants what's best for his son and loves him very dearly. He often has to work late, but makes sure to call his son via webcam every morning, and to make time to see him when he can.
  • Likes Clark Kent, Hates Superman: Mark cares deeply for his son, but thinks those "Flex Fighters" are nothing but trouble.
  • Locked Out of the Loop: He has no idea his son is a Flex Fighter, and it's one of the driving conflicts between him and Jake, who struggles with whether or not he should tell his dad the truth.
  • Manly Tears: He breaks into these in "The Age of Flexarium". When Jake comes home from Dr. C's lair, Mark starts to scold him for returning late, until he admits worrying that something terrible happened to him during the Flexarium army's invasion, and tearfully hugs Jake for coming back safely.
  • My Beloved Smother: He's essentially a gender-bent version of this tropenote , as he's more involved than the average Overprotective Dad.
  • Schedule Fanatic: Not for himself, but for Jake. For instance, he video-calls his son every morning after his alarm goes off just to make sure he's staying on track.
  • Shipper on Deck: Implied to ship Jake and Riya when he encourages Jake to invite her for supper some time.
  • Spanner in the Works: After Rook collects data needed to create another Flexarium army, Brick, Mortar, and Mark Armstrong accidentally help wipe it out.note 

     Grandpa Park 
Voiced by: (English) Sab Shimono

Nathan's grandfather, who eventually discovers Nathan and his friends are the Flex Fighters.

  • Cool Old Guy: He ran a newspaper for years, and suggests the boys use working for him as a cover for their superhero activities. He also has a massive archive of newspaper clippings, which come in handy when one of the super-villains temporarily wipes out Charter City's internet.
  • Doting Grandparent: Nathan's grandfather seems to be this as he is the only member of the family who actually pays attention to Nathan. He also takes it upon himself to be a Parental Substitute to Ricardo.
    Grandpa Park: You're family now, Ricardo. I think of you like my seventh grandkid.
    Isabelle: Eighth!
  • Parental Substitute: For Nathan and Ricardo. Nathan's parents are both fairly present, but his Grandpa supports him when it comes to his double life, which his parents are unaware of. He's more of a straightforward example for Ricardo, whose parents are almost always absent. The latter example becomes more literal by the end of season two, when Ricardo's dad gets a job away from Charter City, leaving Ricardo in the Parks' care for the rest of the school year.
  • Secret Keeper: He finds out Nathan and his friends are the Flex Fighters are overhearing a phone call between Nathan and Ricardo. He tells Nathan he's discovered the truth, then immediately vows to keep their secret and help them out however he can.
  • Smart People Play Chess: He plays this with Mr. Savic.

     Isabelle Park 
Voiced by: (English) Stephanie Sheh

Nathan's younger sister.

  • Adorkable : She takes after Nathan by taking her commitments seriously, yet is also rather cute and precocious.
  • Affectionate Nickname: "Izzy".
  • Cheerful Child: She's normally this, unless someone upsets her enough to get the Silent Treatment.
  • Out-of-Character Alert: Wingspan realizes Dr. Dreamscape trapped him in a dream world when Isabelle and their mom congratulate his accomplishments as a Flex Fighter, even though he didn't tell either of them about his adventures.
  • Outnumbered Sibling: She has seven siblings, but she's the only girl.
  • Pinky Swear: She makes Ricardo "double pinky swear" not to miss her perform in the school play.
  • School Play: "Rise of the Tech Men" has Izzy portray a talking flower in one; Nathan and Ricardo leave Jake alone on night watch in order to attend the show.
  • Silent Treatment: Some of the people she gives this to include Ricardo, after he skips her spelling bee, and her eldest brother, who ate her yogurt once. She starts talking to Ricardo again early in season two.
  • Spelling Bee: Most of her appearances in season one involve preparing for, and later attending, one of these. She lands second place, topping several students older than her.

     Mr. and Mrs. Park 
Mrs. Park Voiced by: (English) Kelly Hu
Nathan's, Izzy's, and their brothers' parents.

  • Feminine Women Can Cook: Mrs. Park seems to do most of the cooking for the family.
  • Good Parents: They seem less strict than most fictional Asian parents, allowing Nathan to date non-Korean Erika, and consoling Izzy after she gets second place in the spelling bee.note 
  • No Name Given: Their first names remain unknown by the time season two ends.
  • Out-of-Character Alert: Wingspan realizes Dr. Dreamscape trapped him in a dream world when Isabelle and their mom congratulate his accomplishments as a Flex Fighter, even though he didn't tell either of them about his adventures.
  • Parental Substitute: They along with Grandpa Park care for Ricardo when his workaholic parents can't make time to. After Mr. Perez accepts a job in another town, the Parks even let Ricardo live with them for the remainder of the school year.
  • The Voiceless: Mr. Park never says anything during the first two seasons.

     Mr. and Mrs. Perez 

Mr. Perez Voiced by: (English) Phil LaMarr

Ricardo's parents, a pair of serial entrepreneurs whose business keeps them constantly on the move and away from their son.

  • The Ghost: Mrs. Perez has never appeared in any present day scenes, unlike her husband, or spoken in the show, unlike the other main kids' mothers; her only speaking part comes from a flashback in the comic.
  • No Name Given: They don't make an official appearance in the first season, but show up in issue 3 of the comic book series, at least. The season 2 episode "Dr. Dreamscape" shows them in Omni's Dream Sequence, and Ricardo's dad appears in person later.
  • Parents as People: Ricardo's parents obviously love him, if the photo of him as a child is anything to go by, and they provide for him very well. However, they're constantly absent from being too busy with their jobs, and never spend any time at home.
  • Put on a Bus: In "Rise of the Tech Men", Ricardo's dad accepts a job in another city, which probably means Ricardo's parents will appear even less often in season three.
  • When You Coming Home, Dad?: Both of Ricardo's parents are almost never around, and Ricardo clearly misses them.

     Sandy Violette 

Voiced by: (English) Kath Soucie

Erika's mother.

  • All There in the Script: The end credits of "Masters of Order" reveal her first name.
  • Brainwashed and Crazy: She first appears while under the Tech Men's Mind Control, and tries to make an appointment for Erika to join her. (Fortunately, Riya transports Erika to a safer place before then.)
  • Satellite Character: The cartoon never shows or mentions Sandy until it needs to give Erika a personal stake in stopping the Tech Men, and saves any details about her normal personality or life until season three. Although, she and Riya appear to have already met offscreen beforehand.

     Kim Armstrong 

Voiced by: (English) Kari Wahlgren

Jake's Missing Mom and Mark's late wife.

  • All There in the Manual: The first issue of the comics confirms Kim's first name.note 
  • Deceased Parents Are the Best: Jake's flashback of her in the first comic depicts her as less strict than Mark.
  • Posthumous Character: She died some time before the show began, and thus only appears in flashbacks and dream sequences.

     Drs. Aadarsh and Isha Dashti 

Voiced by: (English) Eric Bauza (Aadarsh in "Riya's Revenge"), Tony Mirrcandani (Aadarsh in "Rook's Story"), and Nazneen Contractor (Isha)
Riya's parents, two scientists who experimented with Flexarium along with Rook and Dr. C.

  • All There in the Script: Their first names remained unknown until the end credits of "Rook's Story".
  • Death by Origin Story: Rook killed them after they saw him transform into Stretch Monster, then decided to join Dr. C in searching for a Hyper-Flexarium cure. After Riya figured out what happened to her parents, she asked Dr. C to help avenge them, beginning Riya's journey to becoming Blindstrike.
  • Good Parents: "Riya's Revenge" introduces them via a flashback of the couple bringing Riya to the park, where Aadarsh plays catch with her. When she almost loses the ball, he apologizes for throwing it too hard, and later commends her for finding it before returning to the beach house. Riya's parents even designed the armor she wears as Blindstrike.
  • No Sympathy: Isha loses hers for Rook after he disregards hers and Dr. C's warnings not to test Hyper-Flexarium on himself so soon; she declares that Rook deserves to live with the effects of the experiment Gone Horribly Wrong, and only agrees to help Dr. C develop a Hyper-Flexarium cure when reminded of the need to protect everyone else from its side effects.
  • Sigil Spam: Blindstrike's "face" appears on some devices either implied or outright stated to be designed by the Dashtis.note 


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