Daughter of Gregorio and Ingrid Cortez, Carmen starts of as Troubled, but Cute, seeing her family life as dull, hating her brother Juni, and bunked off school. That is until she learns her parents are professional spies, and teams up with Juni to rescue them. Over the films, she becomes a strong-hearted, intelligent and awesome Teen Superspy, forming a strong Brother-Sister Team with Juni.
- All Girls Want Bad Boys: Her relationship with Gary Giggles.
- Alliterative Name: Carmen Cortez.
- Aloof Big Sister: She was initially this to Juni. However, after spending time bonding with him and witnessing their uncle's similar behavior, she was upgraded to a Cool Big Sis / Big Sister Bully.
- Badass Family: Carmen considers family to be the greatest gift in life.
- The Hero: Shared with Juni, although she becomes The Lancer in the third film.
- I Can Change My Beloved: Carmen believes she can stop Gary Giggles acting like a jerk. Ironically, she gives up trying and the rejection seems to help Gary change.
- Last-Second Word Swap: Carmen uses this repeatedly in the films with "shi-ttake mushrooms". The only exception is the third film.
- Overly Long Name: Her full name is Carmen Elizabeth Juanita de Costa Echo Sky Brava Cortez.
- Passing the Torch: To her step-cousins in the fourth film.
- Potty Emergency: Her embarrassing secret in the first film is that she still needs diapers.
- Reluctant Retiree: Subverted in the fourth film. She still works for the OSS but retired from the Spy Kids division when it was shut down.
- Teen Superspy: Named as the best member of the Spy Kids.
- Thicker Than Water: She's more than willing to punch out the boy she has a crush on to protect her brother.
- Troubled, but Cute: Only in the first film, where she skipped school to travel to distant places.
Carmen's younger brother and the shared main protagonist. Initially a bullied child and hiding in his fantasies, Juni matures and uses his intelligence to become a superb Teen Superspy. He forms a strong bond with Carmen in a Brother-Sister Team. He quit the OSS in the second film to become a Private Detective, but rejoins in the third film.
- Annoying Younger Sibling: Carmen originally viewed him as this.
- Anti-Hero: Type II in the fourth film.
- "Awesome McCool" Name: Juni Rocket Racer Rebel Cortez.
- I Work Alone: In the first part of the third film and the fourth film, though in the latter, he admits it didn't quite work out as he'd hoped.
- Overly Long Name: His full name is Juni Rocket Racer Rebel Cortez.
- Private Detective: Juni becomes this in the second film and tries to keep it up for the third film.
- Shout-Out: His middle names are Robert Rodriguez' sons' names.
- Teen Superspy: Considered the best spy in the world by the fourth film.
- Annoying Younger Sibling: It's possible that, like how Carmen viewed Juni, this was how his older brother saw him, even in their adulthood.
- The Atoner: Gregorio hid the Third Brain to prevent the hard work of the OSS from going to waste.
- Badass Mustache: Even though it's fake.
- Bumbling Dad: Pretends to be this after retiring.
- Gadgeteer Genius: Implied to be.
- Heroic Sacrifice: When it looked like Donagan was going to kill Ingrid's parents, he jumped out in front of them to save them. Donagan failed, thanks to his daughter, but this act was enough to get Gregorio's mother-in-law's attention.
- Mad Scientist: Appears as one in the third film where he is shown replicating the Third Brain. Taken Up to Eleven in the fourth film where a dozen replicas are seen.
- Star-Crossed Lovers: With Ingrid and their wedding was nearly crashed by their opposing organizations.
Gregorio's wife and Carmen and Juni's mother. A badass in her own right, Ingrid cares strongly for her family and will defend them with her life.
- Expy: Pre-emptive; her backstory is similar to that of Mrs. Smith...as well as her husband being that of Mr. Smith.
- Happily Married: Despite being initially sent on a mission to kill her future husband (and vice versa), they eventually get married.
- Parents in Distress: She, along with her husband, are captured in the beginning.
- Reluctant Retiree: Not as much as Gregorio. Heck, she's the one who convinces him to rejoin the OSS.
Isador "Machete" Cortez
Gregorio's older brother who stopped speaking to his brother years ago. He is a skilled inventor, having created countless gadgets for the OSS. Upon meeting Carmen and Juni, Machete agrees to reunite with his brother and becomes the Gadgeteer Genius for the kids.
- Aloof Big Brother: He refused to help out his younger brother, especially since his niece and nephew were left without their parents. However, he does grow out of this behavior at the climax.
- Breakout Character: Got his own movie franchise after becoming popular in the first Spy Kids film. Oddly his movies are R-Rated films tied in the same universe as these PG films.
- Defrosting Ice King: He was kind of distant and cold to his niece and nephew, but he does warm up to them a little. After the Anti-Climax, he reconciles with Gregorio.
- Hero of Another Story: Of Machete. According to Danny Trejo; "Machete Cortez in Machete is what Machete Cortez in Spy Kids does when he's not taking care of the kids."
- Jerk with a Heart of Gold: He initially refused to help save his brother and sister-in-law, but he was kind enough to let Carmen and Juni stay for the night.
Grandpa Valentin Avellan
Ingrid's father and the beloved grandfather of Carmen and Juni. He and the Toymaker were once friends until an incident caused by the Toymaker led to Valentin's confinement to a wheelchair. Now a Handicapped Badass, Valentin offers comforting but blunt advice to his family. He plays a major role in Spy Kids 3D when an opportunity to reunite with the Toymaker presents itself.
- Ascended Extra: He's a secondary character in the second film, but in the third film he has a much larger role since Juni invites him into the game.
- Attention Deficit... Ooh, Shiny!: Subverted in the third film, where shortly after being introduced with a new mech body, he goes off after a butterfly....but the butterfly was more important than it first appeared.
- Dashing Hispanic: Well, he is played by Ricardo Montalban.
- Disability Superpower: He is very intelligent and strong for his age thanks to his disability. Subverted in the third film when Juni summons him to the virtual world and gives him a robotic body to walk.
- Forgiveness: Valentin personally releases the Toymaker to forgive him in the third film.
- Happily Married: To his wife, Helga.
- Revenge: Carmen and the Toymaker worried that he only wanted revenge on the Toymaker for costing him his legs. Subverted. He has never forgotten what the Toymaker did to him, but he is quick to forgive him and offer him a second chance.
- Spock Speak: Does this particularly when confronting the Toymaker.
- Super Wheelchair: His wheelchair doubles as an aircraft.
Grandma Helga Avellan
Ingrid's mother. She has an issue with Gregorio, considering him a bad influence on her daughter.
- Happily Married: With her husband, Valentin.
- Never Mess with Granny: She was a former spy, has a jetpack hidden under her clothes and helps fight giant robots in the third film.
- Obnoxious In-Laws: Backseat driving her son-in-law is just one of the ways she irritates him. She softens up a bit after his would-be Heroic Sacrifice.
While not an actual member of the Cortez family, he is considered one and treated like an uncle. Carmen and Juni refer to him as "Uncle Felix" since he pretended to be their uncle, leading to a Running Gag where he reminds him of the truth.
- FaceHeel Turn: Forced to betray the Cortezes by Donnegan to be spared from death. He survives, is forgiven and rejoins the family.
- Honorary Uncle: Their real uncle is Machete.
- Running Gag: Felix continuously reminds Carmen and Juni he is not their uncle. This is thrown out the window when he claims he is their uncle when called to help in the third film finale.
- Secret Keeper: Protected Gregorio and Ingrid's secret from their children until he was forced to tell them.
Presenter of "Floop's Fooglies", Floop is an imaginative inventor whose only goal is to be the greatest kids' television host ever. Unfortunately, his technology has got him involved in the wrong crowd. Uninterested in the evil schemes his clients have, Floop wishes to bring fun and happiness to children.
- Affably Evil: So much so that eventually he crosses the line into a good character; what he really wants is to entertain children with his show.
- Alliterative Name: Fegan Floop.
- Badass Longcoat: Part of his outfit, a rather colorful one.
- Baleful Polymorph: Pulls this on his prisoners to put them in his show.
- Be Yourself: His show teaches the children this lesson.
- Big Fancy Castle: Shaped like a giant boot.
- Depraved Kids' Show Host: Granted his characters are in fact kidnapped and mutated secret agents, but apart from that, Floop is completely harmless and just wants to entertain children.
- Disc-One Final Boss: Is set up as the Big Bad, but is removed from that position just as the film is reaching its third act.
- Disney Acid Sequence: His musical numbers, although they are recorded in his virtual room.
- Evil Genius: Well, not exactly evil...
- Gadgeteer Genius: Invented robots called "Thumb Thumbs", because they look like walking thumbs.
- HeelFace Turn: Thanks to Juni.
- Rebuilt Pedestal: Becomes this to Juni. After his Broken Pedestal speech, calling him out for the villainous deeds in the movie, it turned out he was only working for the actual Big Bad and Floop's main concern was to keep his show live.
- Villain Song: "Dream My Dream" - Although it is actually a promotional song for his show.
Assistant to Floop, Minion seems to be the obedient and loyal servant any well-intentioned megalomaniac hopes for. Actually a former scientist in the OSS who helped make the Third Brain. He overthrows Floop with the intention on using the brain to power his evil army of robotic children.
- Baleful Polymorph: The Cortezes and Floop trap him in the mutation machine, but Minion activates it and ends up with four heads.
- The Heavy: While Mr. Lisp is the true Big Bad of the first film, Minion is the one doing most of the villainy.
- HeelFace Turn: Has had one by the second film.
- His Name Really Is "Barkeep": An evil minion whose last name is actually Minion.
- The Name Is Bond, James Bond: "I believe it's Mr. Minion, now."
- Vocal Evolution: After the mutation machine is used on him, he ends up having a higher-pitched voice alongside the four heads. The second film onwards has his voice back to normal, even though the rest of him isn't.
Robo-Carmen and Robo-Juni
Robotic clones of Carmen and Juni built by Floop and Minion. They are stronger and tougher than their counterparts, although Robo-Juni is a bit of a klutz.
- Alpha Bitch: Robo-Carmen to Juni.
- Beat Them at Their Own Game: Minion creates them for this purpose.
- Butt-Monkey: Robo-Juni. Poor guy can't even talk in the first film.
- The Horde: There's dozens of them.
- HeelFace Turn: Floop turns them into good guys and they become the hit stars of his show.
- Robot Girl: Robo-Carmen.
Mr. Lisp and Ms. Gradenko
An evil businessman and corrupt member of the OSS, Lisp and Ms. Gradenko are in league with Floop and Minion to control the world through clones of the children of the world leaders.
- Bald Woman: Ms. Gradenko becomes this after her hair is burnt off by a jetpack.
- Big Bad: Lisp is the true villain of the first film.
An ally to Gregorio and father to Gary and Gertie Giggles. While saved by Carmen and Juni in the first film, it turns out he has a hobby for trying to conquer the world and tries to use the Transmooker device to rule the world.
- Bald of Evil: His head is shaved bald and is the second film's main villain.
- Big Bad: The main antagonist of the second film.
- Early Installment Weirdness: Look closely at his photograph in the first film and you'll see his original name was Michael Donnagon.
- Easily Forgiven: Allowed to continue working at the OSS as a mere technician by the third film, a pretty light "punishment" for somebody who tried to kill the Cortezes.
- For the Evulz: His motivations in the second film are never explained, nor his need to kill the entire Cortez family, so one might assume his scheme boils down to this.
- HeelFace Revolving Door: Gertie implies it is not the first time he has tried to conquer the world.
- HeelFace Turn: By the time the third film rolls around, he works as a technician at the OSS.
- Henpecked Husband: He reacts with horror when Gertie says she's going to tell his wife that he tried to take over the world again. When said wife appears in the third film, he is much better behaved.
- Karma Houdini: Despite being fired from the OSS by the President of the United States himself, Donnagon somehow ends up back in the organization in the third film, now working as a technician alongside his wife.
- Large Ham: He has an excitable personality, especially when he's talking to the Cortezes.
- Meaningful Name: He really makes his last name make sense with his giggling in the second film. His kids also share this habit.
- Ungrateful Bastard: It can be easy to miss, but he's one of the Fooglies in the first movie. He repays the Cortezes for rescuing him and changing him back by trying to take over the world and kill them.
Gary and Gertie Giggles
Carmen and Juni's rivals in the Spy Kids division and Donnagon's children. Gary is the bad boy of the division, being a bit of a Jerkass but seems to like Carmen. Gertie is mischievous but the more reasonable and brainy of the two.
- Foreshadowing: Gertie tells Juni that everyone he knows is his family, leading to the mass Back for the Finale cast gathering in the third film.
- Girlish Pigtails: Gertie has pigtails which allow her to fly.
- HeelFace Turn: Gertie at first, and Gary by the end of the film, since it turns out he was just keeping up the whole bad boy routine.
- Jerkass: Gary, although this is subverted to Jerk with a Heart of Gold.
- Ship Tease: Between Carmen and Gary, although Juni and Gertie seem to have a bit of a bond in the third film.
- Signature Laugh: At first it seems that Gertie Giggle is the one doing a high-pitched giggle, one that Juni earlier used to hack into their voice activated database. However, it turns out that giggle belongs to Gary who shares the trait with his father Donovan. Making him a Giggling Villain.
- The Starscream: At the last second, Gertie betrays her father by purposefully not programming the disk correctly.
Sebastian the Toymaker is a supervillain imprisoned within cyberspace by the OSS. However, he creates a virtual reality game called "Game Over" with the intention on escaping through the countless gamers reaching the core to free him. He has a dark past with Valentin.
- Enemy Mine: With Grandpa Cortez.
- Ghost in the Machine: He creates three virtual representations of his ghosts; a hippy, a doctor and a soldier.
- Holding Both Sides of the Conversation: An interesting case when the Toymaker speaks to holographic versions of himself - namely a Mad Scientist, a New-Age Retro Hippie, and a Blood Knight.
- HeelFace Turn: Upon earning forgiveness from Valentin, Sebastian deactivates his mech and joins the rest of the cast to celebrate having a family.
- Humongous Mecha: Has an army of gorilla-based mecha when he escapes the virtual world, with one adorned with his visage.
- Reality Warper: Controls his game from within the final level.