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"I want to have friends, and hang out like normal teenagers do! But who would want to hang out with a rusty hunk of metal like me?"
Voiced by: Janice KawayeThe main protagonist and the "16-year-old robot" (built 5 years ago) to which the title refers, a state-of-the-art sentient gynoid automaton created by Dr. Noreen Wakeman five years prior to the series, though she was designed as a 16-year-old girl. Though XJ-9 was designed to be Earth's protector, armed to the teeth with a wide range of weapons, devices, and transformations, she desires to live the life of a normal teenager and often makes this desire quite apparent to her friends and creator.
- Action Girl
- Adorkable: When she gets acquainted with the real world for the first time.
- The Ageless: Since Jenny is a robot, she'll look like a teenager forever, though she does seem capable of maturing mentally. She even has a dream of hanging out with her classmates when they're in the retirement home and she looks no different than the present.
- All of the Other Reindeer: No matter what she does, she will always somehow end back up as the school freak.
- Badass Adorable: A One-Man Army shaped like a cute robot girl.
- Balloon Belly: She inflated more than once, despite being made of metal.
- Bare Your Midriff: Her chassis design is meant to mimic midriff baring clothes, complete with a large exposed screw for a "belly button".
- Beware the Nice Ones: Her temper is incredibly human, all things considered. Combine that with a Hyperspace Arsenal, and you get literally-explosive anger.
- Big Sister Instinct: Jenny is rather protective of Tuck, and generally treats him like her was her little brother. His screaming even helped her when Fighting from the Inside.
- Blue Is Heroic: Her body is white with blue paint on the parts that are like hair and clothing.
- Bratty Teenage Daughter: To Nora sometimes.
- Blush Stickers: The ocassions when she blushes she display a blue-colored one of this variety
- Butt Monkey: She gets this treatment way too often, the worst offenders being "Ear No Evil", "A Robot for All Seasons" and "Killgore".
- Cool Loser: It's hinted that if the school weren't under the tyrannical reign of two Alpha Bitches, Jenny wouldn't be a reject at all.
- Cute Bruiser
- Cute Machine
- Deadpan Snarker: Started developing into this by season two.
- Do-Anything Robot: Her arsenal is downright Hammerspacey.
- Does Not Know Her Own Strength: Sometimes, depending on if it's funny at the moment.
- Fem Bot
- Genki Girl
- Girlish Pigtails: She has metal protrusions on her head shaped like pigtails. She stores a rocket in each which she uses to fly, and they've been shown with other strange functions like antenna, blades, and ears.
- The Heroine
- I Just Want to Be Normal: Combined with I Just Want to Have Friends: Being a superpowered robot wouldn't be so hard for her if there were more bots as advanced as her.
- Jerk with a Heart of Gold: She often shifts between this and Nice Girl, depending on whether the episode is making liberal use of Surrounded by Idiots.
- Jetpack: Not so much as one as a flying robot, as she has rockets as part of her body.
- Loves My Alter Ego: Jenny just considers Sheldon her friend, but falls in love with Silver Shell almost immediately (despite Sheldon trying to make him as repulsive as possible so she'd dislike robot guys). Eventually, he dates her as the Silver Shell, but she ends up hating him because he keeps sneaking off (to hide that their dance was being crashed by the space bikers) and Sheldon decides he'll have better luck with Jenny as himself.
- Magic Skirt: Justified, as that "skirt" is made out of metal and is actually her pelvis.
- Meaningful Rename: Calling herself "Jenny" reflects her desire to be seen as a teenager rather than a machine.
- Omniglot: She has software that apparently allows her to speak any language, though we just see her speaking English and Japanese.
- Pinocchio Syndrome: Averted - she's perfectly fine with being a robot, but wants acceptance and assimilation... which sometimes means playing the trope straight.
- Platonic Life Partners: With Brad.
- Red-Headed Heroine: Once had red body paint, and her makeshift human form is a redhead.
- Ridiculously Human Robot: Jenny thinks, emotes, cries, sleeps, and eventually dreams like a human. About the only humanlike thing she can't do is eat anything besides oil.
- Robot Hair: She sports a pair of metal pigtails. They house two of her jet thrusters.
- Single Woman Seeks Good Man: She's sick of smooth operators, and wants someone sweet and sincere. Sheldon walks by, and she greets him, still wondering where she can find someone like that. There are hints that Jenny will eventually pick Sheldon. Confirmed by Word of God after the series' cancellation.
- Sliding Scale of Robot Intelligence: Average Joe: Emotionally, she's basically like a human teenager—which is to say she can be very mature or very childish depending on the situation. Intellectually, it seems to vary by the episode whether she's a lot smarter than most humans, or basically just like a human with a built-in calculator.
- Statuesque Stunner: She's 6 1/2 feet tall (though this seems to include her hair) and really cute to boot.
- Super Strength: "The strength of a million-and-seventy men," if the theme song is to be taken literally. note
- Telescoping Robot: She provides the trope picture.
- Wake Up, Go to School, Save the World
- Younger than She Looks: Technically has been alive for about 5 years, but has all the mentality of a teenage girl... usually. Jenny being physically five years old was even played as a joke, where a truant officer threw her into Kindergarden for the majority of the episode "I was a Preschool Dropout".
Voiced by: Chad DoreckJenny's best friend and next-door neighbor.
- Casanova Wannabe: Brad frequently insists he's irresistible to the ladies, which always causes any girl present (but Jenny) to turn their nose up at him.
- Cool Loser: Brad has a fairly cool demeanor and a decent fashion sense, but is implied to be pretty low on the social ladder.
- Crouching Moron, Hidden Badass: His over-enthusiasm for trying to be a hero can be more trouble than help, but when he gets serious he can be pretty significant help.
- Distressed Dude: Well, he is a Non-Action Guy.
- I Just Want to Be Special: To contrast him with Jenny's desire to be a normal teenager, Brad wishes he was a superhero like Jenny.
- Nice Guy: Brad is typically a very friendly, upbeat person.
- The Not-Love Interest: He's Jenny's best friend and usual foil, but their relationship is entirely platonic.
- Platonic Life Partners: With Jenny.
- Red-Headed Hero
Voiced by: Audrey Wasilewski, Jess HarnellBrad's little brother.
- Annoying Younger Sibling: Tuck can sometimes be annoying, mostly because he's such a scream queen, though it doesn't seem to hurt his popularity in-universe. Brad even claims, when talking about Kilgore and Tuck, that "annoying + small = popular".
- Badass Adorable: He knows almost as much as Dr. Wakeman about robots.
- Distressed Dude: Even more than his brother.
- Cheerful Child: Tuck is very enthusiastic and smiles almost constantly.
- Kid-Appeal Character
- Large Ham: He's got quite a pair of lungs for a little guy and puts them to use.
- Lovable Coward: He's the most likely to start running and screaming in any situation.
- Only Sane Man: Slides in and out of this if the situation calls. Conversely, in a few episodes he's a pushy jerk.
- Taking Advantage of Generosity: A few episodes have been based on Tuck abusing Jenny's protective nature or his friends' general wishes to help him because he's younger. This generally doesn't end well for him.
- Wholesome Crossdresser:Tuck: What? Can't a guy wear pearls and taffeta around here?
Nora: Strictly speaking, only after 6.
Dr. Nora Wakeman
Voiced by: Candi MiloAn elderly spinster robotics scientist and the one who built the XJ robots, who is often simply refers to as "Mother" or "Mom" by Jenny and her sisters.
- Amazingly Embarrassing Parents: Anytime Nora talks to a peer of Jenny besides Brad and Tuck, expect to her some embarrassing detail about Jenny's design or maintenance.
- Cool Old Lady
- Gadgeteer Genius: She's built incredibly powerful Ridiculously Human Robots as well as other machines like a
- Mad Scientist: One of the saner ones, but some of her inventions and experiments seem to serve no clear purpose.
- Mama Bear
- Meddling Parents
- Motherly Scientist
- Never Mess with Granny: She used to be part of the Skyway Patrol prior to the series. Even in present-day she's far from any definition of "weak".
- Parental Obliviousness
- The Professor
- Sibling Yin-Yang: She has a sister, Wisteria, who she's largely lost touch with for favoring nature over science.
- Shipper on Deck: When Nora first sees Sheldon and everyone is assuming he's Jenny boyfriend, she immediately expresses approval, mostly because he's a gangly scientist-type like her.
- Truly Single Parent: Nora considers XJ-9 her daughter (the other XJ robots somewhat less so), and despite Brad and Tuck always calling her "Mrs. Wakemen", she's never been married.
Sheldon Lee/Silver Shell
Voiced by: Quinton FlynnJenny's self-proclaimed romantic admirer.
- Abhorrent Admirer: Towards Jenny at first, but mellows out of his stalking in later episodes.
- Adorkable: He is quite geeky, but has likeable traits to him.
- Chivalrous Pervert: Towards Jenny. It may seem sometimes that he's only interested in Jenny's robot abilities and design, but in other episodes proven otherwise. For example, once Jenny wanted him to remove all her equipment, and he complied (although reluctantly) and spent hours on end removing all of it despite knowing how she would look afterwards.
- Clark Kenting: Despite rather blatant evidence that Silver Shell is him (the similar names, it's just a "shell" he pilots, and the head crest that looks like Sheldon's hair), no one ever suspects this.
- Crouching Moron, Hidden Badass: Despite frequently prat-falls and his nerdy appearance, Sheldon eventually shows himself to be rather competent, managing to sneak past the Wakeman's security system, help Nora board a Cluster warship, live as space pirate (eventually a captain) for decades, and even spent a while as a secret agent.
- Deuteragonist: Later in the series, he's arguably more in-focus than anyone but XJ-9 herself.
- Distressed Dude: Though this becomes less frequent later on.
- Dogged Nice Guy: Several times his sincere and friendly attitude have gotten Jenny's affection, only to lose it because of a misunderstanding or because Jenny found out something very unpleasant that he'd done recently.
- Dude, Where's My Respect?: It's not that he can't ever get any respect, but he has to work much harder for it.
- Forgotten Phlebotinum: Sheldon treats the Silver Shell suit only as a means to get closer to Jenny. He never thinks of using it for anything else, like defending the Earth from the Cluster when Jenny is MIA in the movie. After Jenny loses her infatuation with the Silver Shell, he only uses it once more, when Tuck finds the thing in his garage.
- Gadgeteer Genius: He's created functioning Power Armor, his own robots (though nothing as human-like as Nora's), new gadgets for Jenny to use, and a functioning time machine.
- Hero-Worshipper: A variant in that he's smitten with XJ-9 as well as seeing her as a role model.
- Large Ham: As the Silver Shell.
- Older Than They Look: The events of "Good Old Sheldon" ended with him physically 15 years old, but 105 chronologically and mentally—and he remembers all of it.
- Rescue Romance: Sheldon meets and falls hard for Jenny after she saves him from some bullies in shop class.
- Robosexual: ""Twin-manifold access ports? Ohh, baby!"
- Single-Target Sexuality: Jenny-sexual.
- Stalker with a Crush: In his introduction episode he was definitively this, but in later episodes he is more friendly and helpful towards Jenny.
- Undying Loyalty: In the Christmas episode, he's the only person to stay by Jenny's side when the entire town has turned against her by this point.
XJ- 1 through XJ- 8
Voiced by: Janice Kawaye (XJ-1), Kath Soucie (XJ-2, XJ-3, XJ-4 and XJ-5), Candi Milo (XJ-6), Audrey Wasilewski (XJ-7 and XJ-8)XJ-9's prototypes and "sisters".
- Big Little Sister: XJ-8 is much larger than Jenny despite being considered her younger sister. She is technically also older (which would make XJ-1 the Little Big Sister), though Jenny seems to have spent the most time online.
- Break Out the Museum Piece: Once, after Jenny got captured by the Cluster, she sent out an emergency beacon that reactivated them. With the exception of XJ-8 they don't appear to be combat-ready, but do okay as they apparently have the same telescoping armor Jenny does.
- Combining Mecha: Not exactly in a true "mecha" sense, but they do have the ability to join together to form various weapons along with the "Robo Wall".
- Cute Clumsy Girl: XJ-3 constantly trips and falls apart.
- Cyber Cyclops: XJ-3 has one physical eye that sits on top of her body while XJ-6 has a computer display face that shows one eye.
- The Eeyore: XJ-7 is constantly depressed, even lamenting that she couldn't destroy herself properly.
- Flawed Prototype: All of them. Unlike most examples of the trope, though, they are clearly functional testbeds that do well within the parameters of their design.
- Frickin' Laser Beams: XJ-2 is basically a laser gun with legs and eyes.
- Green-Eyed Monster: Everyone word XJ-6 says is complaining about someone else, usually Jenny, getting more attention than her.
- Bonus points for her eye actually being green.
- Hiccup Hijinks: XJ-2 constantly hiccups, causing her to misfire.
- Machine Monotone: XJ-8 speaks like this, though the tone changes depending on the episode.
- Motor Mouth: XJ-5 sounds like a used car salesman and never, ever stops talking. Justifiable in a sense; from the look of her eyes and her speaker mouth she may have been constructed using parts from a radio, and radios NEVER stop broadcasting.
- Neat Freak: XJ-4 compulsively cleans everything she sees.
- Ridiculously Human Robots: The XJ sisters appear to be gradually working towards this. May also be why XJ-8 isn't the last in the line.
- Sliding Scale of Robot Intelligence: Most of them are Average Joe like Jenny, but XJ-1 and XJ-2 are closer to Robo-Monkeys, being like a human baby and toddler, respectively. XJ-8 is also a lower-level Average Joe than the rest, being very blunt and thuggish.
- Super Prototype: XJ-8 is physically stronger than Jenny—to the point that she's really not looking forward to fighting her—but doesn't have Jenny's "quirk and charm" according to Dr. Wakeman. Being so terrible at talking to people still makes her a Flawed Prototype even in terms of being a superhero, as she, for instance, thought children breaking a pinata were committing a crime.
Voiced by: Eartha Kitt, Cree Summer ("Around The World in 50 Pieces")The tyrannical queen of the Cluster who constantly tries to get Jenny to go with her to her homeworld of Cluster Prime through immoral means.
- Bee People: She resembles an insect of some sort.
- Big Bad: Vexus is this for the entire show.
- Break the Haughty: She eventually loses her dictatorship over Cluster Prime, reducing her to a madwoman living on a garbage planet and talking to the creatures crawling around it. She's mostly back to normal by the end of the season and menacing Jenny as usual, though without her empire behind her, she's significantly less of a threat.
- Determinator: Even after losing multiple times to Jenny even to the point of losing her status as Queen, she still insists on attacking Jenny any chance she gets.
- Even Evil Has Loved Ones: She genuinely cares about her people. Jenny even exploits this at one point when Vexus had captured Tuck, forcing her to make a hostage exchange for one of her mooks.Mook: Mama!
Vexus: (horrified) My baby!
- Evil Matriarch: Subverted. She may be evil and the Big Bad of the show, but she still loves Vega (almost to the point of being overprotective, even.)
- God Save Us from the Queen!: Cluster Prime's residents are actually good-natured, but they are forced to obey Vexus or be destroyed.
- Hellish Pupils
- Hypocrite: She and the Cluster in general insist humans are unjustly controlling Earth's machines, yet she'll gladly use mind control to force those same machine to join the Cluster.
- Totally Radical: She would have blended in while she was destroying Jenny if she only realized that The Roaring Twenties was over for almost a century now.
- Tsurime Eyes
- Villainous Breakdown: In her reappearance after "Escape from Cluster Prime", she's been reduced to madness, trying to use some random scraps of garbage to build an escape pod and referring Krackus and Smytus by nonsensical names.
- We Can Rule Together: She makes this offer with Jenny, trying to get her to help her robot brethren and destroy the human race. You can guess what Jenny's answer was.
- Voiced by: Steve Blum
- Big Creepy-Crawlies: Resembles an anthropomorphic rhinoceros beetle
- Broke Your Arm Punching Out Cthulhu: Even after he successfully takes over Earth with the Cluster, he winds up without a lower body. Krackus had to build him a few replacements out of trash.
- I Just Want to Have Friends: Hinted at. He perks up quite a lot when he's complimented by the humans, and he has to remind his minions to laugh with him after he makes a short speech.
- Ineffectual Sympathetic Villain: In season 3, he's left as a pathetic wreck who mostly just wants to get his legs back.
- Large Ham: When making his entrance.
- Not Quite Dead: At the end of "Escape from Cluster Prime", he's at the center of an explosion that was suppose to destroy all of Tremorton. By the next season, he's lost his legs, but is still alive.
- Paper-Thin Disguise: He puts on a wig and tries to pass of as Smytlana, a Ukrainian supermodel, after his attempt to break into a fashion designer's private boutique goes awry because the secretary called him fat. After a short while of being complimented, he falls for the disguise himself.
- Voiced by: Jim Ward
- Beware the Silly Ones: Like what Nora tells her daughter, "Don't underestimate him! Sooner or later he may invent something that actually works!"
- Big Creep Crawlies: Bears a resemblance to a large beetle.
- Bungling Inventor: Most of his inventions fall apart after one use.
- Evil Old Folks: He seems mostly harmless, though.
- Ineffectual Sympathetic Villain: Shares this trope with Smytus in Season 3.
- Miniature Senior Citizens: He's the shortest member of the Cluster seen before the Big Damn Movie.
- Not-So-Harmless Villain: He's called one of the most incompetent members of the Cluster, even getting laughed at. Yet most of the time, his inventions work as intended and he is a legitimate threat.
- Robot Hair: Has a metal mustache that also functions as a mouth in imitation of a beetle's mandibles.
Voiced by: Tara StrongA small, adorable wind up robot from a toyline, Killgore somehow managed to attain sentience and decides to fulfill its purpose as a villain, first by joining the Cluster and capturing Jenny, then by destroying the Cluster and Jenny. Things don't always go as planned for him, however.
- Badass Adorable: He managed to outsmart Jenny twice and rebuild Armagedroid, who is millions of times Killgore's size.
- Catchphrase: Surrender and "BA-NAH!"
- Card-Carrying Villain: Killgore insists you read his tag!
- Cute Is Evil: He's considering the cutest thing ever in-series, and a Card-Carrying Villain through-and-through. Jenny's biggest problem with facing him is that she can't fight back without people hating her for it.
- Deathbringer the Adorable: Sure the name may sound threatening, but it's so gosh-darn cute!
- Determinator: Determination and cuteness are basically the only things he has on his side. He nearly ends up driving Jenny insane just by endlessly jumping at her while yelling "Surrender!"
- Enemy Mine: With Jenny in "Enclosure of Doom".
- Evil Sounds Deep: Spoofed in the first few seconds of the episode he's introduced, as it's not wound up yet.
- Harmless Villain: To the point where he was outright rejected by the Cluster.
- Ineffectual Sympathetic Villain: Once Jenny has a chance to destroy Killgore with no one being the wiser, she decides she can't hurt a defenseless creature even if it's driving her crazy.
- Instant A.I., Just Add Water: Why a windup toy is sentient is not remotely addressed.
- Laughably Evil
- My Little Panzer: As much as he claims otherwise, nothing about Killgore's design is dangerous—any danger he poses is instead a result of trickery and persistence.
- The Napoleon: If its 10 1/2 inch stature has any indication.
- Only One Name
- Scare Chord: He keeps saying the classic "buh nah" chord.
- Saying Sound Effects Out Loud: SMACK!
- Third-Person Person
- Villain Team-Up: With Armagedroid in "Enclosure of Doom", it worked...a bit too well.
- Villain with Good Publicity: Sure it may be threatening, but what part of "Villian" don't the people who take a liking to it understand? All of it, apparently.
- Wind-Up Key: It's powered by a watch spring and a wind-up key.
Voiced by: Thora BirchA citizen of Cluster Prime who seems wholly nonconfrontational.
- Blade Below the Shoulder: She gains the ability to grow one once she installs the chip that unlocks
- Mad Scientist's Beautiful Daughter: She's a robot from Cluster Prime, a race previously seen only as hostile. She is also Queen Vexus' daughter, and becomes the queen after Vexus's regime is overthrown.
- Power Gives You Wings: Dragonfly wings, in her case.
- Similar Squad: Her circle of friends look just like Jenny's friends back home, with Vega being the counterpart to Jenny herself.
Voiced by: Audrey WasilewskiAn alien girl with superpowers who met Jenny as part of a team. The team later disbanded, and Misty returned to Earth.
- Even Evil Has Loved Ones: Even when she becomes a selfish mercenary, Misty still considered Jenny her friend and was willing to help her out without expecting anything in return. When Jenny realizes how dangerous she is and they fight, Misty wins but can't bring herself to kill Jenny, claiming it was because no one was paying her for it.
- Evil Cannot Comprehend Good: She was absolutely confused by Jenny's remorse for scaring the Krust Cousins to tears.
- Evil Counterpart: She ultimately ends up as one to Jenny: they're both superheroes that consider themselves outcasts, but Jenny's friends and family motivate her to user her strength for good while Misty's detachment from almost everyone else leads her to abusing her power for personal gain and satisfaction.
- Evil Former Friend: She was pretty much Jenny's best female friend. But Misty got more ruthless to the point she only thought of helping people if she could benefit from it. All to the point where Misty nearly kills Jenny in a fight where Jenny was clearly outmatched (due to a couple of factors). The only thing that stopped Misty and snapped her somewhat back was Jenny still pleading that she still saw her as a friend.
- Human Aliens: She's an alien, but pretty much looks like a human.
- Parental Abandonment: Her and the rest of the Teen Team are apparently all orphans. She tries to justify charging for her services to Jenny by contemptuously pointing out she doesn't have any parents to provide for her.
- Punch Clock Hero: In "Mist Opportunities", she's decided to help people on a pay-only basis, and left Tremorton being destroyed by a monster when they wouldn't pay her for what she'd already done.
- Sudden Sequel Heel Syndrome: When Misty was part of Team Teen, she did superheroics without any expected reward, albeit seemingly because it was fun and with a condescending attitude toward "normies". After coming back to Earth and enrolling at Tremorton High, she shows can be a rather vindictive bully. After she's expelled, then moves back to Tremorton, Misty is basically just a money-grubbing mercenary who'll endanger civilians to get her job done faster.
- Superpower Lottery: Let's see: she's a skilled martial artist, has Super Strength, can fly, turn into mist, shoot laser beams from her eyes, and control peoples' minds.
- Super Smoke: Her most often used superpower is her ability to turn into a cloud of purple mist at will (hence her name).
The Crust Cousins, Brit and Tiff
Voiced by: Cree Summer (Tiff), Moira Quick (Brit)The antagonists of Jenny's life in high school, they seek to humiliate her at every turn.
- Alpha Bitch: They torment Jenny simply because a super-powered robot would otherwise be more popular than them.
- Ambiguously Brown: Brit has dark skin, but otherwise looks and sounds like a stereotypical upper-class Brit.
- Bare Your Midriff: Tiff's normal costume. Some of Brit's fashions in "Victim of Fashion" do it as well.
- British Teeth: Downplayed by Brit, who simply has slightly goofy-looking buck teeth. One Grossup Closeup implies they're much worse than they look from a distance, though more crooked than dirty.
- Even Evil Has Loved Ones: Brit and Tiff do seem to genuinely care about each other as cousins.
- Heel–Face Door-Slam: In their first appearance, Brit and Tiff actually defended Jenny when the police were planning on bringing her downtown after the science lab caught on fire (which they caused), as thanks for saving their lives. They actually wanted Jenny to start hanging out with them, until Brit shook Jenny's hand too hard and dislodged the hair pin Tiff shot into it. As the two were being led away by the police, they blamed Jenny for it.
- Hoist by His Own Petard: More than one of their schemes have terribly backfired.
- The Mean Brit: Brit has the accent and the attitude, though one wonders if she's actually British or not.
- The Quisling: Sided with the Cluster after they invaded Earth in "Escape from Cluster Prime", advising who and where to find people to enslave. Once it looks like the Cluster are losing, they switch back just as quickly.
- Street Smart: Tiff is very much this (more so than her cousin).
- Unlimited Wardrobe: They have a different outfit in most episodes, sometimes many in the same episode.