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Nicktoons
Darry Fenton
- Afraid of Needles: As seen in "Curse of the Wirebot" and "Taste for Change".
- Berserk Button: Don’t threaten or even insult his family and friends.
- Beware the Nice Ones: He is very friendly and outgoing, but don't you dare think about harming his friends and family.
- Big Brother Instinct: As often as he argues with Yuki and is annoyed by her, you'll bet that he'll step up to protect her when she's in danger.
- Break the Cutie: Briefly in “Frightosphere”, and a big one in “Shadow of the Past”. Suffers an even bigger one in "The Terror Within".
- Brought Down to Normal: Loses his ghost powers at the end of Season 2 and doesn't get them back till Season 3's "Steal Titan Rises". Happens again briefly in the Season 3 finale.
- Casting a Shadow: One power he has that his father doesn't is the ability to control his own shadow.
- Chest Insignia: Has one nearly identical to the one his father has.
- Chronic Hero Syndrome: As a superhero or as a Nicktoon, he always jumps in to help his friends and family no matter what the problem is, which is lampshaded by Danny at one time. When he doesn't want to immediately help a friend in danger, something is seriously wrong.
- Cool Shades: Wears a pair in his ghost form.
- Foil: There are differences between Darry and Danny. While Danny sometimes wished he can be normal, Darry embraces his ghost half and quickly became skilled thanks to his dad training him. He also is a lot more reckless and stubborn than Danny and his childishness contrasts to Danny's Shrinking Violet tendencies.
- Foolish Sibling, Responsible Sibling: The foolish to Yuki’s responsible.
- Generation Xerox: He takes up his father's mantle of protecting Amity Park (even calling himself "the new Danny Phantom" at one point.), uses his father's Battle Cry when transforming, and can be a Snark Knight during serious situations (which he likely got from both his parents).
- Heroic BSoD: Has one during the few times he loses his ghost powers.
- Inferiority Superiority Complex: Word of God states that he suffers from this due to the pressure of having to live up to his father’s legacy.
- Interspecies Romance: In "Wrath of Triton", he falls in love with a mermaid princess, Cleo, and spends most if the episode flirting with her. He quickly changes his mind after it's revealed that she is a cyclops.
- Jumped at the Call: He jumped at the chance to be a Nicktoon when offered, and a flashback showed that while he was shocked when he first got ghost powers, he was ready to be a superhero when he realized he would be like Danny Phantom, even before finding out the latter was his father.
- Kid Hero: Like father like son.
- Kiddie Kid: Acts immature and childish for his age.
- Mark of the Supernatural: Has a skunk stripe in ghost form, which is a sign of his status of being one-quarter ghost.
- Nice Job Breaking It, Hero: Due to his reluctance to fight Dark Dan who is possessing Tak in "The Terror Within", the Nicktoon Cadets went after him instead. Even then, he still didn't want to go, so when his friends dragged him along, he messaged his dad to tell them what they were doing. This results in Both the Nicktoons and the Cadets getting captured by Dark Dan to use as bait to lure Danny, and because of Darry alerting his dad to what they were doing, Danny arrived and Dark Dan forced him to surrender so he can take possession of his body. Darry acknowledges that this is his fault and has a Heroic BSoD as a result.
- Shared Family Quirks: During "Shadow of the Past" it is lampshaded how similar he is to his paternal grandfather in personality.
- Snark Knight: Often makes jokes during battle and serious moments.
- Stepford Smiler: As cheerful and childish as he acts. He is deeply saddened by his mother being away on her book tour, and feels that he is not as strong or powerful as his father and won't ever live up to his legacy.
- Strong Family Resemblance: He looks a lot like his father, which is lampshaded many times throughout the series.
- The Hero
- The Leader: Of the Nicktoons.
- Technicolor Eyes: His eyes are green in human form and his eyes are blue in ghost form. The opposite of Danny's eye colors.
- Totally Radical: Has the tendency to yell “gnarly” when excited.
- Uneven Hybrid: His dad is half ghost and half human while his mom is full human. He has the ability to transform like his father, but doesn't have all of his ghost abilities, save for a few that he developed on his own.
- What Does He See in Her?: He is fairly popular with girls his own age (including Kida and Marie Mollusk), but he only has eyes for Francesca Baxter despite her Alpha Bitch behavior and the fact that she both hates and insults him.
- Would Hurt a Child: He nearly hits Maxwell in "Mother Nature's Revenge" after giving him a What the Hell, Hero? for causing the events in the episode. He also attacks Jesse 13 in "Seven", though he wasn't fully in control of himself at the time.
Tammy Turner
- Alliterative Name: Her full name is Tamera Tabatha Turner.
- Attention Deficit... Ooh, Shiny!: Inherited from Timmy, which Cosmo and Wanda have noticed, though she's not as bad as Tommy.
- Brainy Brunette: Is easily the smartest one on the team and she has brown hair.
- Clingy Jealous Girl: Acts like this in Season 1 when Jimmy starts going on blind dates and gets engaged to Cindy. She gets over it between Season 1 and 2.
- Foolish Sibling, Responsible Sibling: The responsible to Tommy’s foolish.
- Generation Xerox: Tends to geek out and obsess with Jimmy when she's around him, much like Tootie did when she was around Timmy, though to a lesser extent.
- Gender-Bender Friendship: Becomes friends with her brother, Tommy, when he is turned into a girl in "Education for Femininity".
- Half-Identical Twins: Tammy is a girl, has perfect teeth, and brown hair.
- Interspecies Romance: Falls in love with Jesse 13, who is a ghost.
- Nice Job Breaking It, Hero: Has one with Tommy in "The Fairy Effect", when she tries to ask the ten-year-old Jimmy to the dance. Her going into the past to talk to the young Jimmy results in Tommy spraying Jimmy in the face with megalomanium to distract him long enough for Tommy to pull her away, and changing the future to where Jimmy grows up to becomes an evil dictator.
- Not So Above It All: Often chides Tommy for doing immature things, but tends to join along.
- Precocious Crush: On Jimmy. She somewhat gets over it after Jimmy marries Cindy.
- The Smurfette Principle: Tammy is the only female member of the Nicktoons, and the first due to the original team having no female members.
- Stalker Shrine: It is mentioned at least once that she has one of Jimmy in her closet.
- The Smart Guy
- Theme Twin Naming
- Tomboy and Girly Girl: Girly girl to Yuki’s tomboy.
Tommy Turner
- Alliterative Name: His full name is Thomas Thaddeus Turner.
- Attention Deficit... Ooh, Shiny!: Inherited from Timmy, which Cosmo and Wanda have noticed.
- Big Brother Instinct: He's actually younger by a few minutes, but he still will NOT let anyone hurt his twin sister.
- Deadpan Snarker
- Generation Xerox: Acts pretty much like Timmy did at 10.
- Half-Identical Twins: Tommy is a boy, has buck teeth, and black hair.
- Jerkass: At times.
- My Sister Is Off-Limits: Subverted. He is perfectly fine with Tammy dating since it would help her get over her crush on Jimmy. The only time it was played straight was with Jesse 13, thinking he was evil at first.
- Nice Job Breaking It, Hero: Has one with Tammy in "The Fairy Effect" when Tammy wants to ask the ten-year-old Jimmy to the dance, and in order to stop her, he sprays the young Jimmy in the face with megalomanium so they can escape, which changes the future to where Jimmy grows up to became an evil dictator.
- Real Men Wear Pink: Wears a pink shirt nearly identical to the one Timmy wore at his age.
- Shipper on Deck: Supports his sister's relationships with Jesse 13 and MX-65. He also told Maxwell that he is supportive of his crush on Tammy.
- Shrinking Violet: In the first episode only.
- Strong Family Resemblance: Looks exactly like Timmy except with black hair.
- Theme Twin Naming
- Why Did It Have To Be Cats?: Has a fear of cats due to an incident with Catman when he was younger. He finally gets over his fear in "Catman Returns".
SpongeTron-Unit 001
- Berserk Button: Never threaten his friends or his robot kind.
- Beware the Nice Ones: He is programmed to be as nice as SpongeBob, but he is shown in his first appearance to be really dangerous if provoked.
- Big Brother Instinct: Towards Max.
- Claustrophobia: Freaks out whenever in confining spaces or in a dark room due to having spent 9 years in a basement after being shut down.
- Dating Catwoman: With Java.
- Do-Anything Robot: No matter the situation, he always has a gadget in his system to help with whatever is going on at the time.
- Foil: Despite being SpongeBob's clone, he can be very different from him in terms of personality. While SpongeBob was considered The Ditz and a Cloudcuckoolander, SpongeTron is sometimes considered the Only Sane Man and is not afraid to use violence when necessary; only acting as a Ditzy Genius when it comes to humans and their relationship with robots. He is also shown to be capable of being leader of the Nicktoons.
- Massive Numbered Siblings: His clones.
- Number Two: He often takes charge of the Nicktoons whenever Darry is out of commission. He even became leader when Darry temporarily retired.
- Omniglot: He is programmed to speak many different languages, he is even able to understand Goddard's barking and SpongeCog 10's growling.
- Robot Buddy
- "Second Law" My Ass!: From time to time.
- Secret-Keeper: Is the only one who knows that Max is a genius.
- Shapeshifter Default Form: Disguises his robot form to look like a younger SpongeBob, due to the fact that the other characters find his robotic appearance creepy.
- The Big Guy
- Voluntary Shapeshifting: Has a cloaking device that allows him to do this. It only made him look like a younger SpongeBob at first, but in Season 2, Jimmy gave him an upgrade that can make him turn into anybody.
- Would Hurt a Child: He tries to kill Darry when they first meet, and tries to kill Maxwell in Season 4 when he worries about him changing their lives.
- Younger Than They Look: Chronologically 9-years-old.
Maxwell
- Alternative-Self Name-Change: Goes by his full name "Maxwell" in order to avoid confusion with his past self. It becomes a recurring theme that those who know his true identity start referring to him as "Max".
- Amplifier Artifact: The neural intelligence device that's attached to him and is increasing his intelligence as well as giving him psychic powers.
- Bratty Half-Pint: Is a loudmouth brat who bullies Darry, is rude to the Nicktoons, and does whatever he wants and disobeys orders. Thankfully, he becomes kinder and more humble as time goes on.
- Broken Pedestal: His rude behavior towards Darry comes from the fact that he is close to the future version of Darry, and is disappointed that in the past, Darry is reckless, immature, and a screw up instead of the famous respected hero he has always known him as. Justified, however, as Darry is still a teenager.
- Catchphrase: Often shouts "Jumpin' Jupiter" when excited about something. Probably as a Shout-Out to his own father's catchphrase "Pukin' Pluto".
- Dark and Troubled Past: He is implied to have one due to having been pressured and teased for not being as smart as his father and from whatever happened that led up to his appearance in the series.
- Early-Bird Cameo: A different version of him appeared in "The Fairy Effect", where he was a living embodiment of the Retroville Crytsal cloned by an evil dictator Jimmy Neutron, using his and Cindy's DNA. In fact, when he first appears, Tammy and Tommy initially mistake him for MX-65.
- The Fifth Ranger: Joins the Nicktoons in Season 4.
- Hidden Heart of Gold: His Jerkass behavior is a way to hide his vulnerable side and that he is hiding something dangerous that he's involved with in his own time period.
- In the Hood: He first shows up in the present with his hood covering his face.
- Inferiority Superiority Complex: It's revealed in "United We Can't Stand" that his Jerkass behavior comes from this.
- Jerkass: At first until Character Development kicks in, turning him into a Jerk with a Heart of Gold.
- Kid from the Future: Is an older version of Jimmy and Cindy's son, Max, from ten years in the future.
- Malicious Misnaming: Frequently calls Darry "Scottie" just to annoy him. It actually stems from his Broken Pedestal (as stated above), but even after becoming closer to Darry, he still refers to him as Scottie until Darry can prove himself a well-respected hero like he is in the future.
- Mind over Manners: When he gains the ability to read minds, he unwittingly uses it to learn personal secrets about those around him and blurts it out. He stops doing this once he learns control, but it doesn't stop him from reading anyone's mind when he thinks their hiding something, friend or foe.
- Never My Fault: Often refuses to take responsibility for things that are his fault.
- Pre-Teen Genius: Thanks to wearing the Neural Intelligence Device.
- Psychic Powers
- Mind over Matter: He is able to move stuff with his mind.
- Shock and Awe: He gains the power of astrakinesis in "Hunt of the Future".
- Telepathy: Gained the ability to read minds in the episode "Mind Over Maxxer", though he still has trouble transmitting his thoughts to others.
- Teleportation: Was shown to have this in "The Little Genius".
- Shared Family Quirks: He is as hot-blooded as Cindy and uses his own version of his father's catchphrase.
- Strong Family Resemblance: Looks like a male version of Cindy with blue eyes and a hairstyle similar to his father.
- Used to Be a Sweet Kid: Compared to Baby Max, he definitely lost his sweet innocent side over time.
- Verbal Tic / Sesquipedalian Loquaciousness: Sometimes indulges in this unwittingly due to the neural device increasing his intelligence.
Nicktoon Cadets
Yuki Fenton
- Aerith and Bob: Has a Japanese name despite none of her family being from Japan.
- Badass Normal: She doesn't have ghost powers like her father and brother, but she can hold her own in a fight.
- Daddy's Girl: Yuki has shown that she and Danny are very close and she gets very upset if Danny spends too much time with Darry (usually to train him) instead of her. An interview with Danny had him stating that Yuki is the most similar to him in personality.
- Deadpan Snarker: Especially when she is around Darry.
- Foolish Sibling, Responsible Sibling: The responsible to Darry’s foolish.
- Fortune Teller: Enjoys telling her friends' fortunes and even puts up a tent in her backyard to charge people to read their fortune under the guise of "Madame Yuki".
- Generation Xerox: She loves to hunt ghosts much like her father's side of the family and is a Deadpan Snarker in the same way as her mother. She is also oblivious to her best friend's very obvious crush on her like her father was to his best friend's crush on him.
- Like her paternal aunt, she is also jealous of her brother having ghost powers.
- I Just Want to Be Special: Displays this sometimes due to her brother being the one who inherited their father’s ghost powers.
- Oblivious to Love: Almost as bad as her father. Poor Crash.
- Spider-Sense: Has inherited the ability to sense ghost from Danny, which unlike the way it works for the latter, is described as a tingle being sent up her spine rather than being connected to another ghost power.
- Strong Family Resemblance: Aside from having her father's blue eyes, she looks a lot like her mother and even like her father's Opposite-Sex Clone.
- The Hero
- The Leader: Of the Nicktoon Cadets.
- Tomboy and Girly Girl: Tomboy to Tammy and Kida’s girly girl.
- Uneven Hybrid: Her dad is half ghost and half human while her mom is full human. Unlike Darry, she doesn't have a ghost half and the only ghost power she seems to have is a ghost sense.
Crash SquarePants
- Alliterative Name: With his real name "Sydney SquarePants".
- Bash Brothers: With Twitchy.
- Big Brother Bully: Can be this way toward his sisters; a flashback showed he was like this towards Junior at first, but eventually warmed up to him.
- Big Brother Instinct: Towards Junior. This even extends towards his younger sisters and wrestled a bear to protect them in "Camp Keep a Nicktoon Down".
- Determinator: Nothing can sway him from doing dangerous stunts.
- Embarrassing First Name: Sydney, which he doesn't like to be called by anyone, and causes Tommy to laugh every time he hears it.
- Fiery Redhead: He has a tuft of red hair underneath his helmet.
- Generation Xerox: He resembles SpongeBob in appearance, but personality-wise he is a lot like Sandy right down to southern dialect and need for action.
- Interspecies Romance: With Yuki, though one-sided on his part.
- Jerkass Realization: Has one in "Wrath of Triton" when he realizes how much danger he puts his little brother in with his stunts that he even breaks down in tears and has to be comforted by Cleo, who assures him that despite his earlier Jerkass behavior, he realized the error of his ways.
- Jerk with a Heart of Gold: He can act stubborn and destructive most of the time, but he is always nice to his friends and family.
- Lethally Stupid: Engages in life-threatening stunts despite his parents' and friends' protests.
- Only Known by Their Nickname: "Crash" turns out to be just a nickname. See Embarrassing First Name above.
- Shared Family Quirks: Uses his own euphemisms like Sandy, and has a laugh like SpongeBob, and tends to cry when he gets emotional.
- Strong Family Resemblance: Out of all his siblings, he looks the most like SpongeBob except without eyelashes or freckles.
- Too Kinky to Torture: Brushes off the many injuries he gets from doing dangerous stunts.
- The Lancer
Twitchy SquarePants
- Bash Brothers: With Crash.
- Big Brother Instinct: As much as he loves assisting Crash with his stunts, he won't let him do anything that frightens Junior too much, and even gets in a fight with Crash in "Wrath of Triton" when he thinks that one of his stunts had hurt Junior.
- Big Eater: He is usually seen eating junk food.
- Meaningful Name: An interview with SpongeBob states that he was given his name because he twitched a lot as a baby.
- Motor Mouth: HealwaystalkslikethisandonlyCrashcankeepupwithhim!
- Strong Family Resemblance: Looks like a scruffier male version of Sandy.
- Sweet Tooth: Is always eating sweets and looking for sweets to eat.
- The Smart Guy: Word of God states he’s actually intelligent, but never uses it since he only cares about eating sweets.
- The Unintelligible: Due to his sugar rush giving him a Motor Mouth speech, hardly anyone knows what he's saying. Crash usually has to translate what he says.
- Twitchy Eye: Hence his name.
- Youthful Freckles: Inherited from SpongeBob.
SpongeBob SquarePants Jr. (Junior)
- Annoying Younger Sibling: Fits this trope more than the rest of his siblings.
- The Baby of the Bunch: He is the youngest of his siblings and the youngest of both Nicktoon groups. He even acts like a baby most of the time.
- Berserk Button: Do NOT be mean to his family and friends. Seriously don’t.
- Beware the Nice Ones: If his Berserk Button is ever pushed, he'll use his Super-Strength to smack villains around. He'll also yell at his friends if they are ever fighting.
- Cheerful Child: Exemplifies this the most out of SpongeBob's children.
- Cloudcuckoolander: Mostly due to his age, and probably something that he inherited from his father.
- Companion Cube: Sometimes carries around a stuffed jellyfish doll called Mr. Jelly.
- Dead Guy Junior: Inverted. He is named after his still living father.
- Forgot About His Powers: If he is really afraid, he forgets he has super strength which could easily get him out of dangerous situations.
- Generation Xerox: He is exactly like a younger SpongeBob.
- Hollywood Tone-Deaf: He obviously did not inherit SpongeBob’s singing abilities.
- Lethal Chef: He also did not inherit SpongeBob’s cooking skills.
- Strong Family Resemblance: He has blue eyes like his father (but bigger pupils) and an identical pore count, but has darker skin like his paternal grandmother.
- Super-Strength: To make up for the skills from his father that were passed on, he did inherit Sandy’s strength.
- Technical Pacifist: Or “Pacifierist” as he calls it.
- The Ditz: Mostly due to his age.
- The Big Guy: While the youngest member of the cast, he is definitely the strongest of the Nicktoon Cadets.
Kida
- Clingy Jealous Girl: Acts jealous whenever Darry shows interest in another girl.
- Daddy's Girl: Spends most of her time with Tak since he is training her to control her shaman magic.
- Girlish Pigtails: Wears her hair in long pigtails.
- Precocious Crush: On Darry.
- Shared Family Quirks: At one point, she gives Yuki an affectionate punch in the arm, just like Jeera used to do to Tak.
- Staff Chick: And she needs it to control her powers.
- The Chief's Daughter: Her mom is the chief of the Pupununu.
- Tomboy and Girly Girl: The girly girl to Yuki’s tomboy.
- Uneven Hybrid: Her mother is a human while her father is half human and half Juju, making her one quarter Juju as a result.
- Wise Beyond Their Years: Despite being one of the youngest, she often acts mature for her age.
- Why Did It Have to Be Snakes?: Has a fear of Nightmare Juju, though it's her fear that actually that actually helps the Nicktoons defeat him.
Adult Nicktoons
Jimmy Neutron
- Badass Longcoat: His lab coat functions as this.
- Commitment Issues: Refused to date anyone for reasons that weren’t explained until “Search for the Five Crystals” and afterwards married Cindy. Though an interview with him states that he dated a few girls before the series and in "Return of Phantom", it's revealed that he dated Dani.
- Crazy-Prepared: Usually has the correct gadget or plan to solve whatever problem is occurring.
- Gadgeteer Genius: Grew up to be quite a successful one.
- Happily Married: To Cindy at the end of Season 1. As much as they argue, they are clearly very happy together.
- Heroic BSoD: Has one in "Shadow of the Past" after Goddard is destroyed by the villains to break him into talking.
- In "Future Tensed" after learning that he was the only one who failed to recognize Maxwell was his son, which leaves unable to function properly throughout most of the episode.
- Insufferable Genius: At times, though he is usually laid back.
- Papa Wolf: Becomes one after Max is born. He is also one to the rest of the kids before and after he becomes a father.
- He would've killed Eustace and Future Eustace for everything that's happened to Maxwell had his friends not stopped him.
- Locked Out of the Loop: In regards to Maxwell's true identity, he was the only one unable to see the very obvious hints,
- Parents Know Their Children: Subverted. He is completely oblivious to the fact that Maxwell is the future version of his son until it is spelled out for him by all of his friends, leaving him an emotional wreck afterwards. He claims afterwards that he did feel some sort of connection with him, but did not think anything of it.
- Really Gets Around: Despite his commitment issues, the "The Bachelor Party" has Jimmy reveal during a drunken stupor that he used to be this and even lists off the names of women he was once involved with.
- Ridiculously Successful Future Self: He’s owner and founder of the Nicktoons, an action movie star, AND a scientist.
- Sesquipedalian Loquaciousness: Often indulges in this.
- Slap-Slap-Kiss: His marriage with Cindy.
Danny Fenton
- Amazingly Embarrassing Parents: Invokes this along with Sam in "Dum Luv" by embarrassing Darry in front of Francesca's family so she won't wanna date him.
- Broken Bird: His last battle as Danny Phantom really effected him.
- Dark and Troubled Past: Fifteen years ago, Dark Dan Phantom returned and captured his friends and family and Danny had to fight to save them. During the fight, Dan impaled his left shoulder and Danny managed to power up his ice ability to freeze Dan and imprison him in another dimension. But due to his injury, Danny came close to dying and had to be given and blood transfusion by Vlad of all people. It was after this that Danny decided to retire and not let his children know what happened.
- Half-Human Hybrid: Is half ghost as the result of a lab accident.
- Happily Married: Very much so with Sam.
- Heroic BSoD: Suffers a BIG one in "The Terror Within", which Darry has to snap him out of.
- My God, What Have I Done?: Feels this way during “Shadow of the Past”.
- Nice Job Breaking It, Hero: His reluctance to share his secret with his children leads to the events of “Shadow of the Past”.
- Papa Wolf: He won't let anyone, not even his friends, accuse his son of being a danger to everyone because of his ghost powers.
- Retired Badass: Quit being Danny Phantom years before the series began, though he is still quite capable of fighting.
- Scars Are Forever: Has one near his left shoulder that came from his Dark and Trouble Past.
- The Stoic: Tries to be.
- Ungrateful Bastard: Many years prior to the series, he was critically injured and it was Vlad that performed a blood transfusion that saved his life. Despite this, Danny acts bitter about it and doesn't appear grateful even after Vlad's Heel–Face Turn, at least until the Season 2 finale where he genuinely thanks Vlad for saving him and his son's lives.
Timmy Turner
- Alliterative Name: Timothy Tiberius Turner.
- Happily Married: Even though we never see his wife, it can be assumed that his marriage is happy since he talks positively about her.
- Manchild: Part of the reason he still has fairies.
- Open-Minded Parent: Can be this way with his kids and is even approving of Tammy dating a ghost (since it's better than her crushing on Jimmy).
- Papa Wolf: He blows off an important meeting at work to fly into space and rescue his kids from the planet of his identical clones.
- Parental Obliviousness: Leaves his kids with abusive babysitters. But unlike his parents, he eventually wises up and gets his kids a better babysitter.
- Reasonable Authority Figure: He allows Tammy and Tommy to wish for whatever they want, but usually limits their wishes so they won't cause trouble.
SpongeBob SquarePants
- Amazingly Embarrassing Parents: In "Polluted Friendship" where he embarrasses Buster in so many ways without even realizing it.
- Beware the Nice Ones: Don’t EVER hurt his children.
- Happily Married: The fact that he and Sandy had seven kids shows how true this is.
- Interspecies Romance: Married Sandy and had seven kids with her!
- Manchild: Not as much as he was when he was younger ironically.
- Out of Focus: Doesn’t appear as often as the rest of the adult Nicktoons.
- Papa Wolf: Karate kicked Professor Calamitous's robot when it was about to step on Twitchy, and he had to be held back by his teammates when he wanted revenge on Eustace Strych after he nearly killed Junior.
- Reasonable Authority Figure: Is not afraid to put his foot down when his kids misbehave.
- Took a Level in Badass: Is much stronger and more competent than when he was younger.
- Wacky Parent, Serious Child: With Buster.
Tak
- Grand Theft Me: As revealed in "The Terror Within", He was possessed by a portion of Dark Dan Phantom after the latter was destroyed in "Shadow of the Past" and was slowly recovering until he can take control of Tak and use him to forward his plans. Tak was unaware of this the whole time.
- Half-Human Hybrid: Is the son of a human man and Aurora Juju.
- Happily Married: With Jeera.
- Out of Focus: Appears even less than SpongeBob.
- Papa Wolf: Don't underestimate him if you try to hurt Kida.
- Pelts of the Barbarian: Wears a long fur cape and fur leggings that stretch over his feet like bear paws.
- Slap-Slap-Kiss: With Jeera from what we’ve seen.
- Took a Level in Badass: He is the first of Danny's teammates to stand up to Dark Dan Phantom and assists the Nicktoons in defeating Nightmare Juju.
- Why Did It Have to Be Snakes?: He is afraid of Gongru Snakes and Howler Juju.
Villains
The Syndicate
- Chuck Cunningham Syndrome: The Syndicate consist of Professor Clamitous, Plankton, Mr. Crocker, and sometimes Traloc; with Vlad mysteriously absent and only getting a mere mention in the first story. Vlad finally appears in “Shadow of the Past” having been reformed.
- Demoted to Extra: Become this in Season 2 after DarkEvil becomes the main antagonist.
- Shoo Out the Clowns: They appear in the first story of Season 2 and bring back DarkEvil and afterwards make little to no more appearances, probably as a sign that shit is about to get real.
- Would Hurt a Child
DarkEvil LaserPants
- Ax-Crazy
- Berserk Button: No one EVER removes his mask.
- Ends up becoming his last words
- Big Bad: Of Season 2.
- Canon Foreigner: From SOLmaster’s “Future Shock” fanfictions.
- Future Me Scares Me: For SpongeBob, though the scare part is downplayed since he had gotten over the fear of his future self prior to the series.
- Hoist by His Own Petard: Is killed by Dark Dan Phantom not long after bringing him back to recruit him as his Dragon.
- I Hate Past Me: Despises SpongeBob for how chipper and heroic he is, and wants nothing more than to kill him.
- Impaled with Extreme Prejudice: Dark Dan Phantom kills him by impaling his fist through his chest.
- Jerkass
- Kick the Dog: Does this to the Nicktoons from time to time, most notably to Darry in “Shadow of the Past”.
- Killed Off for Real: At the end of the Season 2 finale.
- Would Hurt a Child: Tries to kill Darry in "Shadow of the Past" and has no qualms about hurting the SquarePants children.
SpongeCog 001
- Antagonist in Mourning: In Season 3 following his master's death.
- Ax-Crazy: Big time.
- Don't You Dare Pity Me!: Tries to kill Darry after the latter tries to offer sympathy and a chance of redemption following DarkEvil's death.
- Even Evil Has Loved Ones: Despite how cruel and abusive he is, SpongeCog is extremely loyal to DarkEvil and is devastated when he is killed, which leads to his Villainous Break Down.
- Evil Counterpart: To SpongeTron.
- Evil Twin Cousin: SpongeTron refers to him as this.
- Fantastic Racism: Has an immense dislike for humans, whom he refers to as "squishies", and his main reason for hating SpongeTron is because he loves and protects humans.
- Good Colors, Evil Colors: His metal is painted black and red while SpongeTron’s is painted blue and yellow.
- Jerkass
- Killer Robot
- Put on a Bus: As of "Confrontations", he is deactivated and stored away as punishment for all his crimes with no certainty of whether he'll return or not.
- Red Eyes, Take Warning
- The Dragon: To DarkEvil LaserPants
- Villainous Breakdown: He is hit hard with this after DarkEvil's death.
- Voluntary Shapeshifting: Has the ability to do this due to having the same type of cloaking device as SpongeTron.
- Shapeshifter Guilt Trip: A favorite tactic of his, done to SpongeTron in "The Spy and the Sponge".
- Would Hurt a Child: Even one as young as Max.
SpongeCogs 008, 010, and 013
- Affably Evil: They follow their creator, DarkEvil LaserPants, without question and will mercilessly fight the Nicktoons. But they are shown to care about one another, unlike SpongeCog 001, who doesn't give crap about any of them. 008 and 013 even go against his orders of attacking 010, who was siding with the Nicktoons at the time.
- All Your Powers Combined: SpongeCog X has the abilities of all three robots.
- Dumb Muscle: SpongeCog 013.
- Eldritch Abomination: Some time during the Time Skip, SpongeCog took them apart and combined them into the giant robot, SpongeCog X
- Evil Is Bigger: SpongeCog combines them for this purpose.
- Hulk Speak: 013 speaks this way.
- Katanas Are Just Better: SpongeCog 008 has four arms that are katanas and he even looks like a samurai.
- Killer Robot: A lesser extent than SpongeCog 001. See Affably Evil.
- Killed Off for Real: SpongeCog X is blown up by an explosive as a Mercy Kill by SpongeTron.
- The Brute: 013.
- The Evil Genius: 008.
- The Unintelligible: 010.
- Tragic Monster: It's implied by SpongeTron that they were taken apart to be built into SpongeCog X against their will and have no memory of what they once were, being forced to follow all of SpongeCog's orders.
Mickey
- All Girls Want Bad Boys: Yuki seemed to have a crush on him when he first appeared.
- Archenemy: To his cousins, Tammy and Tommy.
- Babysitter from Hell: Just like his mother.
- Blackmail: Does this to Tammy and Tommy using a video of their first talent show.
- Crocodile Tears: Uses this to fool the adults in "Cousin Calamity".
- Dirty Coward: As shown in "Cousin Calamity".
- Disappeared Dad: His father has never been seen or mentioned.
- Evil Nephew: To Timmy.
- Evil Red Head
- I Just Want to Be Special: Wants to have a fairy godparent of his own to use as a weapon after seeing Poof.
- Jerkass
- Military School: Is currently attending one.
- Technicolor Eyes: Inherited Vicky's pink eyes.
Java
- Affably Evil: Despite her criminal tendencies, she does have a soft spot for SpongeTron.
- All Girls Want Bad Boys: Her reason for liking SpongeCog.
- Anti-Villain: While she is not as evil and dangerous as most of the rogue robots in the series, she fights against the Nicktoons whenever they try and stop one of her thefts, joins in villainous groups if it benefits her, and is not above using SpongeTron's affections for her to get her own way. But there have been times that if SpongeTron is ever in real danger, she will help him and his friends.
- Cargo Ship: SpongeTron has been in love with her since she was an inanimate coffee maker.
- Daddy's Little Villain: Plankton built her for this purpose. It worked a little too well.
- Dating Catwoman: She's a robot/squirrel version of Catwoman.
- Even Evil Has Standards: She may not share SpongeTron's fondness for humans, but when it comes to Max, she is shocked at SpongeCog's willingness to kill him.
- Karma Houdini: She always gets away scott-free in the end, usually thanks to SpongeTron.
- Kiss of Death: Later gains the ability to electrocute anyone she kisses.
- Manipulative Bitch: She can manipulate SpongeTron into doing whatever she wants, using his love for her.
- Playing the Victim Card: Likes to do this to SpongeTron and he falls for it every time. He seems to have gotten smarter about it by "Voluer de Mon Amour" though.
- Robot Girl
Dark Dan Phantom
- Ax-Crazy
- Battle in the Center of the Mind: The final battle between him, Darry and Danny takes place in Danny's subconscious after he and Darry overshadow Danny.
- Demonic Possession: Does this to Tak and Danny.
- The Dreaded: The adults are horrified by the mere mention of him. He is also the reason Danny is both overprotective of his children and somber most of the time.
- Future Me Scares Me: Nightmare Juju shows how true this is for Danny.
- Human Popsicle: Was imprisoned like this in another dimension for 15 years thanks to Danny's cryokinesis.
- I Hate Past Me: Calls Danny an overgrown brat for thinking he can be rid of him.
- I Work Alone: Makes this painfully clear to DarkEvil LaserPants when the latter suggest they team up to destroy the Nicktoons, by impaling DarkEvil in the chest and killing him.
- Jerkass
- Killed Off for Real: Finally becomes this at the end of Season 3 after the remaining part of him is destroyed by the Nicktoons.
- Villain Team-Up: DarkEvil brought him back for this purpose. See I Work Alone above.
- Villainous Breakdown: During his final confrontation, he starts to lose his cool when Darry manages to gain control of his Ghost Rage.
- Walking Spoiler: You can't really say his name without giving away The Reveal in the Season 2 finale
- Would Hurt a Child: Regardless if they're his own children from an alternate timeline.
- Your Soul Is Mine!: Somehow gained the ability to absorb ghost halves from humans in order to make himself stronger. He ripped out Vlad's ghost half and absorbed it, and tried to absorbed Danny and Darry's ghost halves from their bodies in order to kill them.
Eustace Strych
- Abhorrent Admirer: Towards Cindy, much to her and Jimmy's annoyance.
- Ax-Crazy: Especially when being influenced by his business partner.
- Bad Boss: Threatens to fire some of his employees if they can't invent a weapon that can out do Neutron's inventions.
- Big Bad: Of Season 4.
- Corrupt Corporate Executive: Is the owner and founder of a famous technology company called "Strych Enterprises", but is ruthless to his employees and scheming with a mysterious benefactor to crush Jimmy Neutron.
- Driven by Envy: He pushes his employees to work harder and is working with a mysterious partner because he is jealous of Jimmy's success and that he is in charge of the Nicktoons, a team that Eustace wants to be in charge of.
- Eldritch Abomination: Turns into one after going back in time to give himself ghost powers the same way Danny did, which backfires horribly. Luckily it gets undone when Jimmy fixes the timeline.
- Evil Counterpart: To Jimmy. They both grew up to be famous distributors of technology, but while Jimmy matured into a rather polite gentleman who makes all of his gadgets himself, Eustace is still a petty bastard who pays people to make everything for him so he can sell them for a profit.
- Faux Affably Evil: He is fairly polite and charming to whoever he speaks to, including Jimmy and the Nicktoons on good days. Underneath his polite façade, he's unpleasantly malicious and petty.
- Jerkass: He is cruel and obnoxious, and is willing to team up with someone he barely knows to defeat the Nicktoons.
- Locked Out of the Loop: Ironically, he is the only one unable to figure out that his business partner is really his future self.
- Manipulative Bastard: He manipulates the Nicktoons into trying to help him when they first meet, and is easily able to sway Junior into wearing a neural intelligence device he created just to test it out.
- My Future Self and Me: Though he is unable to figure out that his business partner is really this.
- Rich Bastard: Along with being a successful business owner, he is a billionaire, but also a selfish ruthless jerk.
- Rival Turned Evil: He is working for a mysterious benefactor who wants Jimmy dead.
- Tantrum Throwing: Still does this as an adult, though to a lesser degree.
- Villain with Good Publicity: Is a well-known business owner of "Strych Enterprises" that invents and distributes electronic devices, and even has the news media on his side when Jimmy tries to out him as a bad guy, making it look like Jimmy is the crazy one.
- Would Hurt a Child: He has no problem trying to kill Maxwell or any of the Nicktoons. He even puts a faulty neural intelligence device on Junior, knowing that it could potentially kill him.
Eustace's business partner
- A God Am I: His increasing intelligence (and growing insanity) and psychic powers cause him to believe this.
- Ax-Crazy: Even more so than Eustace.
- Badass Longcoat: Wears a lab coat similar to Jimmy's.
- The Dreaded: Maxwell sees him as this.
- Exhausted Eyebags: Sports these just to show how crazy he's become.
- Future Badass: He is Eustace's future self who came in possession of a neural intelligence device that gave him psychic powers and allowed him to take over the future Retroville.
- Future Me Scares Me: Eustace is initially shocked by how far is future self is willing to go in order to achieve power, especially after trying to kill him.
- Man Behind the Man: Is essentially this to Eustace.
- Mind Rape: Did this to Jimmy in the future that left him catatonic and gave the Future Eustace insight on everything Jimmy knows.
- He does this to Maxwell by implanting fake memories in his mind and making him think no one care about him and swaying him onto his side to use against the Nicktoons. He attempts to do the same thing on Darry, using similar imagery, but is less successful.
- Psychic Powers:
- Force-Choke: Does this to Darry and Jimmy at different points.
- Mind over Matter: Like Maxwell, he can move objects with his mind. He can also levitate his body, making it look like he can fly.
- Shock and Awe: Has the power of astrakinesis.
- Telepathy: Has the power to read minds, transmit his thoughts to others, and even implant false memories into others.
- Teleportation
- Sesquipedalian Loquaciousness: Speaks like this due to possessing his own neural intelligence device that is making him smarter.
- Walking Spoiler: His identity as Eustace's future self is this, along with the fact that he has his own neural intelligence device and has psychic powers.
- With Great Power Comes Great Insanity: His version of the neural intelligence device makes him smarter, but also twists his mind.
- Would Hurt a Child: Is working with Eustace to kill Maxwell and take his neural intelligence device.
- You Have Outlived Your Usefulness: Does this to Eustace, despite the fact that he's his past self.
Others
Max Neutron
- Babies Make Everything Better: Is an adorable baby that everyone loves and is able to secretly help out the Nicktoons from the sidelines.
- Badass Adorable: Despite being a baby, he can get himself out of danger and has even rescued SpongeTron.
- Brainy Baby: Is intelligent thanks to being the son of two geniuses.
- Companion Cube: Has a teddy bear called Edwin Huggles.
- Fearless Infant: Even when being used as a hostage, he doesn't bat an eye.
- Gadgeteer Genius: Which he inherited from his father.
- Strong Family Resemblance: Other than having blue eyes like Jimmy, he looks a lot like Cindy (which Timmy thinks is a relief).
- Tagalong Kid
- Wise Beyond Their Years: He is definitely smarter than most of the older characters.
Buster SquarePants
- Big Brother Instinct: As distant as he acts, he still cares about his younger siblings.
- Embarrassing Nickname: "Bustie" is this for him. Cue bra jokes.
- Emo Teen: Ironic for being SpongeBob’s son.
- Hates Being Touched: Shows discomfort when being hugged.
- I Know Karate: Inherited his mother's karate skills.
- Interspecies Romance: Begins dating Marie Mollusk, who is an octopus.
- Perpetual Frowner: Compared to the rest of his family, he rarely ever smiles. The only time he is constantly happy is during Christmas.
- Shared Family Quirks: Has SpongeBob’s laugh, which he HATES.
- He’s also a very capable singer and musician.
- The Sixth Ranger: He doesn't wish to join the Nicktoons, but there are times where he joins them if needed.
- The Quiet One: He didn't speak a word until “Robot Love”, after which he talks more frequently while still choosing to remain silent most of the time.
- Used to Be a Sweet Kid: Flashbacks show that when Buster was younger, he was much more talkative, a Cheerful Child, and a bit of a crybaby much like his father.
- Wacky Parent, Serious Child: With SpongeBob.
- What Does He See in Her?: This question is raised after he falls in love with Squidward's niece, Marie Mollusk.
- Youthful Freckles: Like Twitchy, he has some that he inherited from SpongeBob.
Jesse 13
- All Girls Want Bad Boys: Part of the reason Tammy, Yuki, and a bunch of other girls are attracted to him. Averted since he is actually a really nice and polite kid.
- Casting a Shadow: Has the ability to turn into a shadow that looks like the one Johnny 13 was able to create.
- Cool Bike: Like his father. It's actually a moped, but it's most likely because he is not old enough to actually drive a motorcycle.
- Interspecies Romance: With Tammy.
- Red Eyes, Take Warning: Averted in normal form, but played straight in his shadow form.
- Generation Xerox: He rides around on a Cool Bike and tends to use flirty pickup lines. But unlike his father, he is very polite and generous.
- Strong Family Resemblance: He looks like a mini version of Johnny 13, but has red eyes like his mother.
- The Sixth Ranger: Is offered a spot on the team by Tommy for when he learns to better control his powers. He even joins briefly after Darry temporarily retries.
- 13 Is Unlucky: His shadow form is triggered when he is around bad luck.
- Weakened by the Light: The only way to bring him back to normal is to shine a bright light at him.
Sam Fenton (née Manson)
- Amazingly Embarrassing Parents: Invokes this in "Dum Luv" where she and Danny embarrass Darry in front of Francesca's parents so she won't want to date him.
- Distressed Damsel: In "Wrath From Beyond" where she is kidnapped by a samurai ghost who tries to force her to marry him. Also in "The Terror Within" and "Shadow of the Past" where she is nearly attacked both times by Dark Dan.
- Granola Girl: Is a vegetarian. She often tries to get her kids to eat vegetables as well.
- Happily Married: Very much with Danny.
- Mama Bear: Fights off a ghost samurai in "Wrath From Beyond" to protect Darry and Yuki, and nearly punches Jimmy's lights out in "United We Can't Stand" after he loses track of Darry in another dimension.
- Missing Mom: Is absent for most of the series since she is traveling around the world for her career as an author. She visits from time to time, but this doesn't stop Darry from feeling depressed about her not being around.
- She's back to stay by Season 3 though.
- Most Writers Are Writers: Is a professional author, and from what we've seen, most of her work is based upon her husband's life as a teen.
- Open-Minded Parent: Adopted this parenting style, probably in contrast to how her own parents were.
- Reasonable Authority Figure: Even if she gives her kids the freedom to do what they want, she is stern with the rules when she has to be.
- Soapbox Sadie: Is still this as an adult, unsurprisingly. She even helps Tammy form a petition to stop oil spillage.
- When You Coming Home Mom?: Yuki and Darry wonder this when they miss her while she is on a book tour.
Cindy Neutron (née Vortex)
- Distressed Damsel: She is kidnapped in "Reign of DarkEvil".
- Happily Married: Despite the fact that she argues with Jimmy a lot, they are very happy together.
- Jerk with a Heart of Gold
- Last-Name Basis: With Jimmy even after they're married strangely enough. This is Lampshaded by Jimmy who expresses his frustration about the whole thing. She begins referring to him by his first name after Max is born.
- Mama Bear: She flips out when SpongeTron 911 accuses Max of a crime in "The Great Zappy Case".
- She is also this way with Maxwell in Season 4, even before revealing that she knew he was really her son.
- Parents Know Their Children: She reveals in "Hunt of the Future" that she knew Maxwell was an older version of her son from the moment she saw him, claiming that it was maternal instincts.
- Slap-Slap-Kiss: Her marriage with Jimmy.
- Tsundere: Something she never outgrew.
- Wacky Cravings: During her pregnancy with Max as seen in "Camp Keep a Nicktoon Down" where she demands Jimmy to get her some pork rinds and purple flurp.
Jazz Fenton
- Cool Aunt: To Darry and Yuki.
- Maiden Aunt: Never married or had children.
- The Shrink: Works as a psychiatrist and has given therapy to Darry, Danny, and Tommy to help them with their psychological problems.
Sally, Dolly, and Allie SquarePants
- Beauty, Brains, and Brawn: Dolly, Sally, and Allie.
- Characterization Marches On: In SOLmaster's "Future Shock 2", they are just the same squirrel in three different bodies. Here they are each given an individual personality.
- Cowardly Lion: Allie joins the Nicktoons after Darry quits, but when face to face with villains, she runs away screaming.
- Neat Freak: Dolly, which she probably inherited from SpongeBob.
- Same-Sex Triplets
- Smart People Wear Glasses: Sally wears glasses and is the most intelligent of the three.
- Southern Belle: Dolly is the only one of the three (and the only one of all the children other than Crash) to inherit Sandy's accent.
- Strong Family Resemblance: They all look a lot like Sandy, especially Sally, given that she has the same fur color.
- Theme Twin Naming
- Tomboy and Girly Girl: Allie and Dolly.
Vlad Masters
- Badass Normal: He may have lost his ghost powers, but he still retains his knowledge of ghosts and his expertise at crafting ghost weapons.
- Beard of Sorrow: He sports one when he first appears. It's gone by his next appearance though.
- Beware the Nice Ones: Now that he's fully reformed, he plays this straight, especially when he sees Darry being threatened.
- Brought Down to Normal: Many years prior to the series, he lost his ghost powers to Dark Dan, who ripped it from his body and absorbed it into himself to make him more powerful.
- Cool Old Guy: Even now that he's in his late 60s and without ghost powers, Vlad can still beat up a gang of street thugs and assist in taking down Dark Dan.
- Deadpan Snarker: He is still prone to sarcastic remarks, especially when interacting with Darry.
- The Exile: He has exiled himself into a cave outside Amity Park that he refurbished into a home for himself. He continues to live there even after he is no longer a criminal due to still no longer having his riches.
- Heel Realization: Just like in "The Ultimate Enemy", losing everything he had made him regretful of everything he had done that made him lose his friendship with Jack and Maddie.
- Pet the Dog: He saves Darry from a group of street thugs that were attacking him, and this was before he even knew who Darry was.
- Reformed, but Rejected: Even after his Heel–Face Turn, Jack and Maddie still act hostile towards him. It isn't until after he helps defeat Dark Dan and saves Darry's life that they accept him and become great friends like they were in college.
- Retired Badass: Forced upon him after losing his powers and exiling himself. But he still assists the Nicktoons in the battle against Dark Dan Phantom.
- Wax On, Wax Off: Vlad agrees to help Darry learn to control his Ghost Rage, but instead has Darry play chess, do yoga, and intentionally pushes Darry's Berserk Button. Vlad later reveals that this was all part of his training to help Darry keep calm in tense situations due to his powers being emotion based.