History Characters / OddSquad

* AffablyEvil: Despite constantly causing oddness and attacking Odd Squad, most of the villains are genuinely friendly towards both each other and even Odd Squad agents. In rare cases some my even aid agents to stop threats.

* SoreLoser: His reaction to losing the rock-paper-scissors competition to Kooky Clown (or who he thought was Kooky)? Attempt to use his powers to flatten him, and inflict serious harm. [[EvenEvilHasStandards Even some of the other villains are against this.]]

* RememberTheNewGuy: Averted. Olive and Otto have no idea who Fladam is before meeting him for the first time at Polly Graph's lemonade stand.

* CatchPhrase: "Trust me, I'm a doctor".

* CuteAndPsycho: Oona is a GadgeteerGenius who is nice to her co-workers and is loyal to Odd Squad through thick and thin. However, unlike her predecessor and mentor, Oscar, her mental health isn't in the best state, and she is often shown to be completely wacky and insane. Perhaps the best example of this is in the episode "The Cherry-on-Top-inator", where she becomes giddy from destroying useless gadgets with her [[DropTheHammer trusty mallet]], coupled with murderous screams.

* StereotypeFlip: The main reason for her creation as a character was to enforce the WomenAreWiser trope and depict girls as being just as powerful and strong as boys. This is especially prominent throughout Season 1, where she is given some of the top billing as a main character in contrast to Otto, who is also a main character but has the least characterization of any of the other three main characters in the season's core cast.

[[In General]]

* TheAgeless:
** She worked a fruit stand before joining Odd Squad back in the year 1870, and still looks 7 years old.
** "Odd Beginnings: Part 2" reveals that she can control whether she ages or not.

* EveryoneCallsHimBarkeep: She is almost always referred to as "Ms. O", which is a title used for female Odd Squad Directors. Only few have referred to her by her first name, such as O'Donahue, Oscar, and Orville, and it's implied that only those close to her (professionally or personally) can refer to her as "Oprah". [[spoiler:In Season 3, she is referred to as "Big O" or "The Big O", which is the title of someone in the position of the same name.]]

* PutOnABus: She leaves in "Odd Off The Press" to assist the Odd Squad Space Unit, although she doesn't step down from her role as the Big O and instead leaves Orpita in charge as her NumberTwo, the Little O. She is the last of the original main characters to leave the show.

* SuddenlyBilingual: According to her interview video, she knows at least 45 different languages by the time she starts up the Odd Squad Mobile Unit. However, she never speaks any other language in the show proper.

* WalkingSpoiler: She becomes this post-Season 2, when [[spoiler: she becomes the new Big O]].

!! Orana and Oliver
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/screenshot_2021_03_08_odd_squad_full_episode_end_of_the_road_pbs_kids_mp4.png]]
-> Played by: Geneva Phan (Orana) and George Holahan-Cantwell (Oliver)
An Investigation partner pair situated in Australia who are close confidantes of Oprah in the first half of Season 3.

* BattleBoomerang: Orana has a Boomerang-inator on her which she uses to attack the Sand Queen in the mid-Season 3 finale. She ends up missing by a long shot, but it does manage to come back to her when the villainess attacks her and she becomes trapped in sand.
* BizarreAlienLimbs: In "Down the Tubes", Orana accidentally zaps Oliver with her Octopus-inator, giving him octopus tentacles for legs.
* BraidsOfAction: Orana wears her hair in a braid extending backwards that is combined with a small bun.
* TheDividual: They are never seen apart and always work together. It's justified, however, since they're partners.
* FieryRedhead: Inverted with Oliver, as he has red hair but doesn't have a temper, and is instead serious.
* LandDownUnder: They both work in an unidentified Australian Odd Squad precinct.
* MrExposition: They serve this role in "Slow Your Roll" and "Down the Tubes" along with Oprah, although they step out of it entirely in the Season 3 finale.
* SpearCounterpart: Oliver looks strikingly identical to Olympia from Season 2, having the same red hair and red glasses and being in the same department.
* TechnoWizard: Both agents are very skilled in the realm of technology. In "Slow Your Roll", they are able to tell the precise moment when the van is being hacked into and taken over by The Shadow.

!!Arctic Mr. O
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/screenshot_2021_08_18_at_02_55_56_teach_a_man_to_ice_fish_mp4.png]]
-> Played by: Ellery Miki-Petite
The Director of the Odd Squad Arctic precinct and Opal and Omar's boss prior to them joining the Mobile Unit in Season 3.

* TheDitz: Very, ''very'' much so, which is directly attributed to him having worked in the Arctic for a long time. Although he's not without his moments of intelligence.
* EveryoneCallsHimBarkeep: He is always referred to as "Arctic Mr. O". His actual name has not been revealed.
* IncompetenceInc: "Teach a Man to Ice Fish" reveals that in addition to being a PointyHairedBoss, his agents (bar Opal and Omar) are all incompetent to some degree. Justified by the fact that like Arctic Mr. O, they're generally isolated from people and from society.
* LastPlaceYouLook: He frequently loses his glasses despite the fact that they're still on his face. However, he never notices they're on his face until he asks where they are and someone points it out.
* LeaderWannabe: Shows shades of this in "Odd Off The Press" where he vies for the position of the [[NumberTwo Little O]] following Oprah's departure. Despite failing in every aspect of Orpita's interview, he repeatedly asks her if he got the job, and even after Denver Mr. O is chosen for the position instead of him, he casually hangs out in Oprah's office. However, when Orpita is chosen to be the actual Little O instead after Denver Mr. O proves himself to be incapable of being in the position, Arctic Mr. O doesn't mind and takes the decision mostly in stride (apart from him mistaking Oprah's "my replacement was here all along" comment as being directed towards ''him,'' not Orpita).
* MellowFellow: Not to the extent of those like Ocean, but he is very laid-back and rarely shows extreme emotion, even when facing down villains.
* NiceGuy: For all his idiocy, he doesn't have a mean bone in his body. Case in point: in "Odd Off The Press", Orpita asks him to recite the "Well, what are you waiting for? Go!" {{Catchphrase}} during her interview with him. He begins to say it, but instead of "go", he expresses concern and asks if his (metaphorical) agent wants to take a day off because he refuses to send them out onto the field if they're getting sick. Orpita reacts to his effort with an exasperated but nonplussed "I would try that again", but it's still quite notable for someone of his department and overall status in the Odd Squad hierarchy, especially since past Directors have been known to be [[MeanBoss Mean Bosses]] at best and [[EnfantTerrible Enfant Terribles]] at worst.
* PointyHairedBoss: He's easily the most ineffective Director seen in the show thus far. Potentially justified by the fact that he works at a barren Odd Squad precinct in the Arctic, which doesn't operate like most precincts.
* PurpleIsPowerful: Subverted. He does wear mostly purple, as it's his department's theme color, but is very weak compared to other Directors such as Oprah and Olive.
* ReallyFondOfSleeping: The ''WebVideo/{{OddTube}}'' episode "Know an O: Part 1" reveals that he's a {{Sleepyhead}} that takes up to ''eight naps a day.'' "Odd Beginnings: Part 1" showcases this in action, as he's shown [[FunnyBackgroundEvent sleeping in his chair]] while Opal and Omar go to their desks with the Bag O' Machines.
* ReassignedToAntarctica: Befitting his name, Arctic Mr. O works at the Arctic Odd Squad precinct. It's not revealed how he came to be in charge of the precinct, whether it was by punishment from Oprah (as the Big O) or by promotion from a previous Director. The "Odd Beginnings" two-parter implies that the precinct's Headquarters doesn't even have ''working heat'' and he asks Oprah for space heaters and hand warmers as soon as he gets the chance, but aside from that, he doesn't seem to mind working there.
* SuperStrongChild: Notably averted. Unlike most Odd Squad Directors, he is very weak and doesn't have much physical strength, if any at all. "Odd Off The Press" has Orpita presenting a board and a cinder block for him to chop, and instead of going right for it like Denver Mr. O and Belgium Ms. O, he asks her incredulously, "With my ''hands?''"
* TrademarkFavoriteFood: As an Odd Squad Director, his drink of choice is water. However, unlike Olive, whose drink of choice is also water, he eats icicles that come in various flavors.
* WithDueRespect: In "Odd Beginnings: Part 2", he has no problem confronting the Big O about taking Opal and Omar away from him since they work for him, and says that if she wants them to quit working at his precinct as Investigation agents and go into the newly-created Mobile Unit department, then she will have to give him something in return. Opal, Omar, and even ''Oprah herself'' immediately grow concerned, but luckily, all he wanted to trade them for were heaters and glove warmers. May be justified by the fact that Opal and Omar are the best agents in the precinct, which doesn't have many agents to begin with, and the decision for them to become a part of a new department working under the Big Office and not a singular precinct is very sudden.
* YankTheDogsChain: He ends up being in control of the chain in "Odd Beginnings: Part 1". Upon Opal and Omar returning to Headquarters and finding that the two identical snowflakes they managed to capture have melted, Arctic Mr. O attempts to cheer them up by offering them some new machines. The two Investigation agents go absolutely ''nuts'' as they scream in delight about finally getting gadgets, all while their boss looks on with a smile...until he simply tells them that no, they're not getting gadgets because it's too cold in the Arctic for gadgets to work effectively. Instead, he gives them a bag of "simple machines", filled with things such as a lever and a pulley, which ends up being a ChekhovsGun.

!!The Shadow
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/screenshot_2020_06_01_screen_shot_2020_02_18_at_10_20_26_am_webp_webp_image_557_767_pixels.png]]
-> Played by: Zarina Rocha
The main antagonist of the first half of Season 3 who has a vendetta against Opal and the rest of OSMU.

* BigBad: Of Season 3.
* CainAndAbel: [[spoiler:The Cain to Opal's Abel. While she is cunning, manipulative, and evil, Opal is more kind-hearted and is working on the heroes' side.]]
* CoolMask: Wears one around her eyes.
* CreateYourOwnVillain: It's revealed that the reason she turned to villainy was because [[spoiler:Opal was far too overprotective of her.]]
* DarkIsEvil: Her outfit is predominantly black.
* DrivenByEnvy: She became a villain because she was jealous of Opal's status as TheAce and she knew that turning to villainy was one thing Opal would never do.
* EnfantTerrible: One of the most malicious kid villains in this series to date.
* EvilGenius: She always manages to stay one step ahead of the Mobile Unit up until "End of the Road". She even gets the idea to [[HoistByTheirOwnPetard use Odd Squad's own MO of teamwork against them by having every single villain in the world team up to destroy them.]] It's very telling that fans voted her as the Oddest Villain Ever on the show's Instagram's "Odd Villain Madness" event, beating out ''Odd Todd.''
* FaceHeelTurn: She ended up doing this due to Opal's behavior towards her.
* GadgeteerGenius: Is very apt with technology, and once successfully hacked OSMU's van. [[spoiler:In "Odd in 60 Seconds", she also manages to get to the mega-computer and extract info about every known villain worldwide, without anyone detecting her.]]
* HeelFaceTurn: [[spoiler:She ends up reforming in the Season 3 finale after Opal convinces her that she can do great things just like her. By the end, she leaves with Opal to fix the damage she caused in various countries.]]
* InvisibilityCloak: Dons one in "Odd in 60 Seconds".
* ItsPersonal: While she's not above attacking the Main 4 in general, she has a grudge against Opal specifically.
* LukeIAmYourFather: [[spoiler:She is revealed to be the younger sister of Opal, much to the agent's dismay.]]
* MeaningfulName: Her alias of "The Shadow" is meant to represent both being stuck in [[spoiler:her older sister Opal's]] shadow, and becoming a shadow of herself when turning to villainy.
* OminousOperaCape: Has a long black one.
* RocketBoots: She wears a pair of these that have red-orange soles. They prove to be useful in "End of the Road" when entering the tornado.
* SecretIdentity: Of a sort. "The Shadow" could potentially be considered an identity that is created by [[spoiler:Olizabeth, Opal's younger sister,]] but she doesn't swap between her "Shadow" alias and her [[spoiler:"Olizabeth"]] one, instead staying as "The Shadow" up until the mid-season finale.
* SmugSnake: There's rarely a moment when she ''isn't'' smug.
* TheSmurfettePrinciple: Out of the four major kid villains in the franchise, she is the only one to be female.
* VillainRevealsTheSecret: In "End of the Road", she reveals her true identity and her relationship to Opal to all of the other villains. Despite being related to someone working for Odd Squad, though, the Villain Network still sees her as a viable villainess and give her no criticism of any sort.
* VillainsOutShopping: In "Slow Your Roll", she wants the Mobile Unit to give up because she has an eye doctor appointment she needs to get to. Eventually Brutus just decides to bring the optometrist to their SupervillainLair, much to her chagrin.
* VillainTeamUp: The trailer for Season 3's first half reveals that her overarching plan is to gather every villain from around the world to form a "Villain Network" in order to take down the Mobile Unit. The episode "Villain Networking", and her overall arc, expands on this concept.

!!Brutus
[[quoteright:333:https://static.tvtropes.org/pmwiki/pub/images/screenshot_2020_07_08_brutus_webp_webp_image_640_360_pixels.png]]
-> Played by: Osias Reid
The Shadow's main henchman.

* DarkIsEvil: Like his boss, he wears mostly black.
* TheDitz: He's very ditzy in contrast to his boss.
* TheDragon: Serves as this to The Shadow.
* EnfantTerrible: Though not to the extent of The Shadow, he does have malicious intent.
* VileVillainLaughableLackey: Brutus is very loyal to The Shadow and is willing to carry out her orders as needed, but can be very dimwitted at times.

!!Sticky Sisters / Sally
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/screenshot_2022_07_27_at_04_13_02_odd_off_the_pressmp4.png]]
-> Sticky Sister #1 played by: Tavia Pereira
-> Sticky Sister #2 played by: AJ Bridel

Two SiblingsInCrime with powers relating to stickiness. They are both named Sally, although they are colloquially referred to as the Sticky Sisters.

* AnimalMotifs: Both of them have gecko motifs, with their outfits and powers resembling that of a gecko's.
* BigApplesauce: "Odd Beginnings: Part 1" has them going to New York City and looking like complete outliers among all the people walking around, being unfamiliar with the city.
* CallingYourAttacks: Every time they attack, they call out what substance they're attacking with.
* CardCarryingVillain: The first Sticky Sister definitely isn't shy about telling others that she and her sister are villains.
--> '''Sister Sally #2:''' Sorry, was I supposed to lie?
--> '''Sister Sally #1:''' Yeah, of course! We lie. We're ''villains.''
* ChainedHeat: A prominent RunningGag with them involves them high-fiving each other, only to get stuck because their hands and fingers are sticky. They then spend a painfully long time attempting to get unstuck. It's such a bad habit that the first Sister Sally has a habit of doing it with other villains, as seen in "Villain Networking", and they also do it with objects that stick to their hands and fingers.
* DiscOneFinalBoss: They serve as the main antagonists for the Season 3 premiere, although it's made clear that they're not the [[BigBad Big Bads]] and are working under another villain.
* DisproportionateRetribution: In "Odd Beginnings: Part 1", they proceed to blast every agent in the Arctic Headquarters solely because Arctic Mr. O asked them if there was a "New York City 2" after they declared their intentions to go ''to'' New York City.
* EvilIsHammy: Between the constant [[EvilLaugh evil laughing]] and the taunts they dole out, yes.
* FoolishSiblingResponsibleSibling: The redheaded, second Sister Sally is more ditzy than her sister, although both of them have their moments of incompetency.
* GreenAndMean: Both of them wear predominantly green and are villains.
* NotQuiteDead: "Odd Beginnings: Part 2" never shows their fates after they try to escape from Orla's crumbling Ancient Headquarters. "Villain Networking" has the first Sister Sally show up, but without her sister. "Odd Off The Press" confirmed that both of them were very much alive and well.
* SiblingsInCrime: They are sisters who work together.
* SuperpowerLottery: Since their forte is sticky things, they have access to a wide range of things they can use as weapons or binding tools, from useful things like tape to mundane but functional things like cinnamon buns.
* TechnologicallyAdvancedFoe: At the very least, they have a better grip on technology and how to use it responsibly than the heroes. The entirety of the "Odd Beginnings" two-parter hinges on them using their smartphones (which agents do not have) to track Opal and Omar, and the 44-Leaf Clover, down.
* WhatIsThisFeeling: In "Odd Beginnings: Part 2", after getting stuck to each other again and collapsing on the ground, the second Sister Sally asks, "Is this a hug?"
* WouldHurtAChild: Most every villain qualifies for the trope to some degree or another. Special mention goes to both Sister Sallies, however, since they left Opal, Omar, Oswald and Orla for dead after both of them go up both staircases and causes Orla's Headquarters to begin collapsing. It's only by SerendipitousSurvival via the [[AncientArtifact 44-Leaf Clover]] do the agents all survive.

[[folder:One-Shot Villains]]
!!Aarti Craft
[[quoteright:981:https://static.tvtropes.org/pmwiki/pub/images/screenshot_2023_07_13_at_13_30_20_double_o_trouble_part_2mp4.png]]
-> Played by: Aurora Browne

An ArtAttacker villainess who has the power to transform any person or object into any arts and crafts project she desires.

* ArtAttacker: Using multicolored laser beams, she can turn any person or object into an arts and crafts project. This can range from tie-dyeing an entire building to simply projecting pom-poms onto a woman.
* AttackBackfire: Sure, she attacks Susan successfully, but unlike a majority of her victims, Susan is actually fine with the way she looks and fully embraces it.
* CurbStompBattle: Delivers one to Oswald and Orla to the point where they don't even have enough time to ''act,'' let alone do so much as dodge. In return, Oxford and Osalind both give her one, putting her through the wringer due to their speed.
* FemmeFatalons: Her colorful nails are pretty long, although she doesn't fight with them directly -- she shoots laser beams in an array of colors at her targets. Oxford and Osalind manage to stop her by firing melon balls at her nails, covering them and leaving her with no way to attack.


[[/folder]]

[[folder:Season Three (''Mobile Unit'')]]
!!Opal
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/img_3188.jpg]]
-> Played by: Valentina Herrera
One of the main characters of Season 3. She and Agent Omar used to work in the Arctic precinct until they got transferred to the newly-created Mobile Unit department.
* TheAce: She is seen as this by The Shadow.
* AgentMulder: She believes in the 44-leaf clover and wishes to find it, and eventually does along with her Omar, Oswald and Orla.
* AscendedFangirl: She is a big fan of Soundcheck and gets the chance to meet them in "Music of Sound". She later helps the members of the band come back together when Orla inadvertently makes them break up.
* BetterWithNonHumanCompany: Implied and inverted. Opal is fine with other human beings (unless they're villains) and gets along with them well, but the "How to Keep Your Squad Happy" Training Video implies that she isn't too fond of animals, as she previously told Omar that he can get any pet he wants provided that she can't see it.
* BewareTheNiceOnes: Making this girl angry is a very, ''very'' bad idea.
* BigSisterInstinct: An exaggerated example with [[spoiler:Olizabeth. Opal refused to let her fire big gadgets, play CaptureTheFlag with a laser chicken, or even play the tuba in band class because she was too afraid that Olizabeth would get hurt. Her fear is somewhat justified by the fact that Odd Squad is a deadly organization that can lead to any employee's untimely death, but it was too much for Olizabeth and she decided to turn to villainy instead. Once Opal realizes what she's done, the two reconcile.]]
* BloodKnight: Has shades of this, as she is often the first to throw down against, and antagonize, villains.
* ButForMeItWasTuesday: By "It's Not Easy Being Chill", fighting oddness becomes something she regularly engages in and loves doing, which is quite a big jump considering she never had to fight oddness when working in the Arctic.
* CainAndAbel: [[spoiler:The Abel to The Shadow's Cain. Compared to her sister, Opal is far more benevolent and kind.]]
* CaptainsLog: Starts one in "It's Not Easy Being Chill" which ends up being the catalyst for The Shadow's HeelFaceTurn.
* {{Catchphrase}}: "We are an ''elite'' team of agents..." There's a whole monologue to follow, [[CatchphraseInterruptus but she rarely gets past the above sentence.]]
* CompetitionFreak: She can get very competitive at times, and it can be hard to make her develop common sense. The episode "Mr. Unpredictable" confirms that she's well aware of this flaw, but is also quick to deny it when she is called out on it.
* CreateYourOwnVillain: [[spoiler: The Shadow mentions that Opal made her who she is. Come "End of the Road" and it's revealed that her words hold merit -- Opal's consistent sheltering of her when the two were agents-in-training caused her to perform a FaceHeelTurn and become a villain, something Opal would never dream of doing.]]
* CuteButCacophonic: Opal may be adorable, but her screaming and yelling could put Oprah to shame in terms of volume. She's easily one of the loudest agents on the show.
* DesperatelyLookingForAPurposeInLife: Her main goal is to be noticed by the Big O so she will be transferred to another Odd Squad precinct where she can put her skills to better use. By the end of the season premiere, she ends up accomplishing this by being transferred not into a different precinct, but into an entire newly-created department.
* GenkiGirl: Although she's not hyperactive all the time like Olympia, Opal can get very excitable and noisy.
* GoGetterGirl: She is very much driven by ambition, starting from when she was working at Arctic Mr. O's Headquarters and continuing to be ambitious when becoming a part of the Mobile Unit department.
* HiddenDepths: When attempting to stall Orchid in "Slides and Ladders", a [[https://static.wikia.nocookie.net/oddsquad/images/7/7c/Whiteboard.png/revision/latest?cb=20210128040237 whiteboard]] is shown as Opal rattles off answers for her question of how to beat a laser chicken. Considering the drawings and complicated math equations, it's implied that Opal may have more mathematical talent than she lets on (or at the very least, artistic talent).
* JumpedAtTheCall: As soon as she finds out that Oswald had discovered the map to the 44-leaf clover, she's quick to jump on board and begin setting out on an adventure to New York City with no regard for what Arctic Mr. O would think. She keeps this trait upon being promoted to the Mobile Unit department.
* TheLeader: Once the Mobile Unit is formed, she takes on the role as the de facto leader of the team up until her departure, when Orla becomes her successor in the role. However, according to the pitch bible for Season 3, she can be very possessive about her leader status and has a very hard time giving up control to her teammates.
* LivingLegend: She's not one herself, but her intent with the Mobile Unit department is to make others view it as one. Given how other agents view it and how "Odd Off the Press" made it become famous enough to get press conferences, it's safe to say she succeeded.
* MusicalAssassin: In "Wax On Wax Odd", Opal is taught how to play the keyboard by way of Orla teaching her how to make pizza the day prior, and uses her newfound ability to hypnotize and drive away a giant purple snake.
* NumerologicalMotif: 44, which is her badge number. She also vowed to save and protect the 44-leaf clover, an ancient Odd Squad artifact. Relatedly, 43 is the ArcNumber for Season 1 and is associated with Odd Todd, the season's BigBad who was [[spoiler:Olive's former partner]] -- and The Shadow, Season 3's BigBad, is [[spoiler:Opal's younger sister.]]
* PenPals: Before the events of Season 3, she exchanged letters with Oswald. One of the things they discussed is the location of the 44-leaf clover, which kickstarts the plot of "Odd Beginnings".
* PluckyGirl: She is very determined and will often charge into cases head-on, dragging her teammates behind her regardless of if they're ready or not. Even if things aren't working out in her favor, she almost never gives up and is always ready to kick odd butt.
* PutOnABus: She leaves the Mobile Unit in "End of the Road" in order to stay behind with her sister, reverse the damage she caused in other countries, and make amends with her.
* ReallyFondOfSleeping: The "Powering Through a Power Nap" Training Video reveals that she has perfected the art of "power napping", having the ability to take short, 1-minute naps and wake up well-rested. An interview video released before the premiere of Season 3 also reveals that her favorite gadget is the Sleep-inator.
* ThePerfectionist: Even moreso than Olympia. She views OSMU in very high standards and strives for the team to be perfect, to such an extent where it's considered a FatalFlaw in some cases. This is evident in episodes such as "Running on Empty" and "Down the Tubes" and even gets a deconstruction in "Jeremy".
* ReassignedToAntarctica: She used to work in the Arctic Odd Squad Headquarters with Omar prior to being moved to the new Mobile Unit department.
* SafetyWorst: [[spoiler:The season finale reveals that the reason her sister became a villain was because Opal was overprotective of her to excessive degrees when the two were attending the Odd Squad Academy.]]
* StraightMan: To Omar.
* SuddenlyBilingual: She can understand and speak Spanish, although she only demonstrates it in "The Void".
* TrueCompanions: With Omar, who was her sole partner when the two of them were working in the Arctic. Their partner bond is so strong that when Omar was feeling upset about not being able to buy a souvenir in "Train of Thoughts", Opal decided to go full {{Determinator}} and find him one because she knows how important souvenirs are to him.
* UnknownRival: [[spoiler: Unbeknownst to her, the Shadow has a grudge against her. The reason for this is set up as the main mystery for season 3.]]

!!Omar
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/img_3189.jpg]]
-> Played by: Jayce Alexander
One of the main characters of Season 3, he and Agent Opal used to work at the Arctic precinct until they got transferred to the newly-created Mobile Unit department.
* BigEater: It's a trait he shares with one of his predecessors, Otto.
* CuteButCacophonic: Like Opal, he's one of the loudest agents on the show and has a tendency to scream a lot.
* DemotedToExtra: In Season 2 of ''WebVideo/{{OddTube}}''. He was originally meant to be the host before Orla was made to be the host instead, and he only appears in two episodes as a side character.
* TheDitz: Omar isn't very bright. For example, in "Running on Empty", he tries to use porous things to catch the blob.
* TheGoodKing: In "Odd Squad in the Shadows", Omar becomes this to the rest of the Shadow League, going so far as to tack on a "please" to his orders. He even wears a CoolCrown made out of office supplies.
* HiddenDepths: "The Void" reveals that unlike the rest of OSMU, Omar can't rollerskate. He manages to learn how to with the help of Oneta.
* TheLancer: Serves as a comical {{Foil}} to everyone in the team no matter who he's paired with, but especially Opal.
* TheLightfooted: It's shown in "Jeremy" that Omar is very agile and dodges attacks effortlessly, to such an extent that it leaves Monsieur Papier-Mache exhausted.
* MellowFellow: Not as much as other agents like Ocean, but Omar considers himself to be very chill and only a sparse couple things can get him riled up. Because he's so mellow, he serves as a mediator for arguments and a key to diffusing tension-filled situations.
* NiceGuy: Very friendly and affable.
* OnlySaneMan: Sometimes serves this role to Opal.
* PerpetualSmiler: He's pretty much always smiling.
* ThePollyanna: He always looks on the bright side of things. This was true even when he was working in the Arctic.
* ThePowerOfFriendship: Odd Squad as an organization runs on this as an MO, but Omar is one of the few agents who has it as his own MO and sticks by it. His {{Catchphrase}} when answering his phone is "Omar's House of Friendship", and "Running on Empty" even has him separating him and his teammates into two separate groups just so they can all bond with each other (due to the fact that he and Opal have been partners since before the season began), something that would become a mainstay in future episodes.
* SuddenlyBilingual: Averted in his case, as he is the only agent of the Mobile Unit who can't speak Spanish up until he learns how to in "The Void".
* SuperheroTrophyShelf: Omar is defined by his love of collecting souvenirs, which he keeps on the other side of the hidden wall located in the Mobile Unit van (and which he refers to as "Omar's House of Awesomeness"). He always tries to get at least one from every location he and the rest of the Mobile Unit visits. Not being able to get one, for whatever reason, immediately sours his optimism, and if the reactions of Opal and Oswald when inquiring about taking him to Crimson Carl's house with them in "Odd Squad in the Shadows" are any indication, it's a sore spot for him.
* SuperGullible: Due to his [[TheDitz ditzy]] nature, he's known to be gullible at times, which is something that the other agents like to exploit for their own benefit.
* TeamSpirit: The pitch bible implies that when working in Arctic Mr. O's Headquarters, he didn't feel like he was a part of a team. When he gets promoted to the Mobile Unit department, he's more than thrilled to be working in a team.
* VibrantOrange: Omar is cheerful, upbeat and cool. He wears an orange tie, shoes and belt, and the department he's in is associated with the color orange.
* VocalEvolution: His voice gets deeper beginning with "Odd Off The Press".

!!Oswald
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/img_3242_1.jpg]]
-> Played by: Gavin [=MacIver=]-Wright
One of the main characters of Season 3. He used to work at the Odd Squad Museum of Natural Odd in New York City as a "library-museum person", having left to join Agents Opal and Omar on their quest to find the 44-leaf clover.
* ActorAllusion: Oswald states in "The Thrill of the Face" that he has a twin brother who is a tube operator. This is a direct reference to "Hands on a Desk Chair", where O'Paddy, one of Precinct 13579's tube operators, is introduced, who is also played by Gavin [=MacIver=]-Wright.
* BadassBookworm: Oswald loves reading and prefers to stay out of combat rather than jump right into it, but make no mistake -- when he has to fight, he's right on par with the rest of his teammates.
* BigEater: While not to the extent of those like Omar and Otto -- he doesn't let food distract him from the task at hand -- he can pack away quite a bit of food. The episode "Raising the Bar" has him eating three pies in one sitting and still being hungry for a fourth one.
* CowardlyLion: He can be fearful at times, but loves to solve cases regardless.
* DancingRoyalty: Oswald absolutely loves to dance and is quite skilled at it, especially concerning the robot dance. However, when Opal, Omar and Orla praise him on it, he claims that his supposed "robot dance" are actually his normal dance moves. He improves his skill by "Box Trot", though.
* DoesNotLikeSpam: He doesn't like pineapple juice.
* {{Expy}}: Shares some traits with Oscar, being TheSmartGuy of the group who is also quite timid.
* FieryRedhead: Inverted. Oswald has red hair, but he is scared and timid.
* HiddenDepths: "Oswald in the Machine" shows that he's quite skilled at doing the robot dance.
** He also likes throwing snowballs and watching people catch them, as revealed in "Running on Empty".
* InnocentBlueEyes: He's the second main character of the show to have blue eyes, the first being Otis -- most every other main character has brown eyes.
* InsufferableGenius: The pitch bible reveals that his character was originally going to be one, often talking endlessly about certain things to the point where it takes him a long time to actually take action against something. In the show itself, he's a genius, but far from insufferable and self-absorbed.
* InTheBlood: According to him, sitting and working behind a desk is a fate passed down to him from his twin brother, who works as a tube operator in Precinct 13579.
* JumpedAtTheCall: When Opal and Omar meet him for the first time and explain their mission to save the 44-leaf clover, he immediately jumps at the chance of seeing places outside of the Museum of Natural Odd, since he's confined to sitting at the front desk all day. This ends up biting him big-time in "The Thrill of the Face" when he realizes that he never considered the consequences of exploring the world and how much danger comes with it, and how much that would terrify him.
* OnlySaneMan: Serves as this to Opal, Omar and Orla at various points.
* RedIsHeroic: He has red hair and is one of the good guys.
* SociallyAwkwardHero: Due to being so used to working alone and being pushed into a situation with teammates and dealing with the outside community, he can come off as awkward but charming.
* {{Sleepyhead}}: In "Down the Tubes", he enters Tube Station 5, the home of a family, and falls asleep from exhaustion on their table. The end of the episode shows him still asleep while [[TubeTravel riding the tubes,]] and not even Orla -- who is known for being loud and brash -- is able to wake him up.
* TheSmartGuy: The smartest of the OSMU team, thanks to all the knowledge he gained from working at the Museum of Natural Odd. He's an expert on porosity, directions, and basic math.
* ThisIsReality: The pitch bible implies that he often tends to apply what he reads about in books to the real world. Unfortunately, in a WorldOfWeirdness, this hardly ever works, and reality often comes to give him a good punch in the gut.
* YouthfulFreckles: He has some freckles on his face.

!!Orla
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/agent_orla.jpg]]
-> Played by: Alyssa Hidalgo
One of the main characters of Season 3. She is the eldest member of the group, being 500 years old.

* TwentyFourHourArmor: When she is transferred to the new Mobile Unit department, she keeps a piece of shoulder armor that runs down her forearm, which she never takes off.
* TheAnticipator: In "Wax On Wax Odd", she explains to her teammates that she overheard a conversation between a sorcerer villain and a {{Medusa}} villainess as they make plans to cause oddness 450 years in the future. As a result, she wrote down the date they decided to cause oddness in her day planner, and when the Mobile Unit is formed in the present day, she trains them WaxOnWaxOff-style in order to prepare them for the oddities to come. It's also implied in the episode that she planned for her, Opal, Omar and Oswald to come together as a team, but it's never confirmed.
* ArcSymbol: In the second half of the season, Orla is sometimes shown wearing a sundial watch in place of her usual high-tech smartwatch as a RunningGag. She also has "Wait one tiny little notch on the sundial!" as one of her [[{{Catchphrase}} Catchphrases]]. Furthermore, the introduction of another ancient Odd Squad artifact known as the Golden Sundial is part of a StoryArc which focuses on her.
* BadassAdorable: She's a kid who is a fierce and tough ancient warrior. Perhaps the best example of this in action is "Down the Tubes", where she manages to deliver a CurbStompBattle to Tennifer by way of destroying her Scrambler in mere seconds without even flinching.
* BirthdayEpisode: She has her birthday in "Orla's Birthday."
* BizarreTasteInFood: Not that it can be helped since Odd Squad is a WorldOfWeirdness where weird foods are common, but Orla's food preferences are some of the weirdest of any Odd Squad agent. At her 500th birthday party, Omar and Oswald gift her a pie made out of scorpions, and a casting call script for Olando has Orla offering him spider milk pudding as a light snack. That's not to say she doesn't eat normal food though -- in "Odd Beginnings: Part 2", Omar teaches Orla about cinnamon buns, and having eaten nuts and berries as her main diet for 400 years, she decides to give them a try and finds them delicious.
* BoundAndGagged: Her weapon is her Rope-inator, a gadget from ancient times which is made out of stone instead of metal and can instantly trap enemies by tying them up with rope.
* BrutalHonesty: Orla is definitely not afraid to speak her mind whether what she says will hurt someone or not.
* ButForMeItWasTuesday: By "It's Not Easy Being Chill", she views battling numerous oddities as a completely normal thing, which is likely due to all the experience she had guarding the 44-leaf clover.
* CallARabbitASmeerp: Being an ancient Odd Squad agent, she does this a lot. Segways to her are "horseless chariots", while brains are "memory balls". It even goes to such an extent where she refers to water -- something that's quite common in the Amazon -- as "nectar".
* {{Catchphrase}}: Says "Onward ho!" just before setting off on adventure.
** Also has "Wait one tiny little notch on the sundial!" which was originally a single CallARabbitASmeerp moment in "Train of Thoughts" before being upgraded to a catchphrase in the second half of the season to coincide with a StoryArc that focuses on her.
* CharacterBlog: Hosts Season 2 of [=OddTube=] in place of Olympia.
* CharacterizationMarchesOn: In early episodes of Season 3, she was more of a BloodKnight, reveling in the chance to do fierce battle and being disappointed when cases turned out to be simple with little fighting required, since that's what she was used to as the guardian of the 44-leaf clover. However, over time she has become more sensible and doesn't actively try to find action in cases that require menial tasks to be performed, but can still kick plenty of odd butt when need be.
* ChildSoldiers: Prior to guarding the 44-leaf clover, Orla was in a heated war between Odd Squad agents and villains, all battling to see who could control the clover. It's left ambiguous if there were any casualties since the show has a strict NeverSayDie policy, but Orla, along with three other agents, made it out alive and was eventually chosen to guard the clover.
* CluelessBoss: Becomes one in "O for a Day" due to her sheer inexperience at being an Odd Squad Director, believing that the job is easygoing and that there's plenty of time for relaxation.
* CompanionCube: Had one in the form of Bouldy, a giant boulder situated in her old Amazon Headquarters, until they broke off their friendship for an unexplained reason.
* CoolHelmet: She wears one as the guardian of the 44-leaf clover, which is known as the "protector's helmet". She sheds it when she becomes part of the Mobile Unit department, though.
* CreepyCave: "End of the Road" reveals that she used to live by herself in a dark spacious cave. It's implied that she never liked living there, as she cries when explaining to Opal that had she not helped to form the Mobile Unit, her living situation never would have improved.
* DoesNotLikeSpam: She doesn't like pizza.
* DreadfulMusician: Surprisingly averted -- Orla is a very skilled singer, and manages to pull off an awesome duet with Opal in "Slow Your Roll".
* DreamWalker: "In Your Dreams" has her becoming one along with Osmerelda, entering the dreams of the Little O in order to help her find the Dream Weaver's Bad Dream Machine and free her from her constant nightmares caused by the villainess.
* DynamicEntry: Employs this in one of her battle moves, which is known as "Smash and Grab".
* FashionableAsymmetry: She wears a braid wrapped in golden wire on one side of her head and a low ponytail on the other side, with the rest of her hair wrapped in a fan bun on the top of her head.
* FasterThanTheyLook: Despite the fact that Orla is 500 years old, she has very high stamina and is able to walk and run for long periods of time without getting tired.
* FishOutOfTemporalWater: Being an ancient warrior, she is very unfamiliar with the modern world. Once she becomes a part of the Mobile Unit, she gradually starts to learn about modernity and begins to fit in, which happens quite quickly due to her fast learning skills.
* FluffyTamer: The pitch bible implies this, stating that she has the ability to tame a jaguar. The episode "Slow Your Roll" also has her mentioning how she used to wrestle crocodiles and alligators within the span of a day. Justified due to living in the Amazon for most, if not all, of her life.
* KnightInShiningArmor: She fits this to a near-T, minus all the romance stuff.
* TheLeader: Takes this position in the group following [[spoiler: Opal's departure.]] She also becomes the temporary leader of OSMU in "Odd Squad in the Shadows".
* LeeroyJenkins: Has a tendency to rush through things and be impulsive, which often bites her in the butt more often than not. Her EstablishingCharacterMoment has her immediately charging at Opal, Omar and Oswald and tying them up in rope, mistakenly believing them to be villains despite the fact that they're in professional uniforms and are children like her.
* MundaneObjectAmazement: Give her an explanation of what the Internet is and she won't do so much as bat an eye. Show her how a sandwich is made, on the other hand...
--> ''"They put stuff on bread and then put another piece of bread on top of that! Are you guys seeing this?!"''
* TheNameIsBondJamesBond: She initially introduces herself to Opal, Omar and Oswald as "Orla, Agent Orla".
* NoSenseOfHumor: Orla doesn't understand humor all that well. Omar's clown antics while he suffers from Clown-itosis in "Into the Odd Woods" fails to make her even do so much as crack a smile, and she can't grasp what makes the classic ChickenJoke so funny.
* NoSocialSkills: Comes with being a FishOutOfTemporalWater. Upon meeting Soundcheck in "Music of Sound", for example, they extend a fist to her so she can fist-bump them, but instead, she grabs the fist and shakes it as though she's performing a handshake.
* PintsizedPowerhouse: She is far and away the strongest member of the Odd Squad Mobile Unit.
* PubescentBraces: She wears these beginning in "Odd Off The Press", although she refers to them as "tooth armor".
* ReadTheFreakingManual: Orla is definitely not one to read a manual or any sort of book to figure out how something works. However, unlike those like Otis and Otto, she believes it's because that Odd Squad agents in general don't need them.
* Really700YearsOld: She looks like a kid, but she's really 500 years old.
* ScarredEquipment: Her shield is quite run-down compared to her teammates' shields, which isn't helped by the fact that it's made out of wood. The ancient Odd Squad shield she's gifted in "Orla's Birthday" is also littered with scratches and chips.
* ScaryScorpions: Orla keeps some in a box that she keeps in her {{Hammerspace}} spine, which she usually releases (or tries to release, anyway) to settle arguments.
* SomethingOnlyTheyWouldSay: In "Odd Beginnings: Part 2", she asks Opal, Oswald and Omar a question that only an Odd Squad agent could know in order for them to prove that they work for Odd Squad and aren't villains. Her question, however, is surprisingly simple, as she asks what letter all agents' names start with. Naturally, all three of them guess correctly.
* SpockSpeak: Speaks in [[YeOldeButcheredeEnglishe a fancy and direct way]], and doesn't use contractions.
* StockAnimalDiet: Subverted. Her main diet while living in the Amazon were nuts and berries, but she's a human being, not a bear.
* SuddenlyBilingual: Along with Opal and Oswald, she is revealed to understand and speak Spanish in "The Void". However, it's justified in her case, since she originally resided in the Amazon rainforest.
** Zigzagged in "Portalandia", where she seems to understand a sign in the Portal Master store that's written entirely in Japanese, but her English translations are incorrect.
* TechnologicallyBlindElders: Mileage varies on whether she could be considered elderly (since she's 500 years old but is still a child), but she has no idea what the Internet is when Opal brings it up. Omar explains that it's like a library, but it works faster and has way more [[TheInternetIsForCats cat videos.]]
* {{Telepathy}}: She has the ability to communicate via telepathy, as shown in the ''WebVideo/{{OddTube}}'' episode "Oddness in NYC".
* UnaffectedBySpice: In contrast to Oswald, Orla has a very high heat tolerance. The ''WebVideo/{{OddTube}}'' episode "Happy Twelve-iversary" even has her chugging a bottle of hot sauce like it's nothing, mistaking it for juice that happens to taste like red peppers.
* UndyingLoyalty: During her {{Backstory}} in "The Weight of the World Depends on Orla", it's shown that Orla and Osmond, another agent selected as a candidate for the role of being the 44-leaf clover's guardian, competed for the protector's helmet, and when Osmond supposedly tripped and fell, Orla chose to help him over getting the helmet. Unfortunately Osmond tripping and falling was a WoundedGazelleGambit on his part and he manages to get the helmet before her, but Ancient Ms. O, who led Orla's ancient Headquarters, gives it to Orla due to her selflessness. Even in the present day, Orla is shown to be extremely loyal to Odd Squad and to her teammates, and isn't afraid to help them out when they're in peril.
* VocalEvolution: Like Omar, her voice gets deeper and becomes more baritone beginning in "Odd Off The Press".
* YouAreInCommandNow: In "O for a Day", she is forced to fill in for Seattle Mr. O at his Headquarters, becoming co-Directors with Omar. Since she has no experience being in the Management department, however, she proves to be quite inept at the job.
* YoungEntrepreneur: Becomes one in "Overdue!" where she teams up with Oswald to run stands selling various things in order to get money to pay her library fine as a result of an ExtremelyOverdueLibraryBook.

!! Esmerelda Kim / Osmerelda Kim
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/screenshot_2021_02_26_esmeralda_kim_webp_webp_image_640_360_pixels1.png]]
[[caption-width-right:350:[[labelnote: Click to see her as an Odd Squad agent.]]https://static.tvtropes.org/pmwiki/pub/images/osmerelda_cropped1.png[[/labelnote]]]]
-> Played by: Glee Dango
A girl who serves as the RunningGag of the season before [[spoiler: becoming a member of OSMU, replacing Opal.]]

* AccidentalMisnaming: [[spoiler: "Odd Off The Press" reveals that her real name is actually ''Osmerelda'' Kim, and that everyone else has been referring to her as "Esmerelda Kim" by mistake. This is what allows her to be eligible to join Odd Squad, and by extension, the Mobile Unit, as Opal's replacement.]]
* AdorablyPrecociousChild: She's younger than any of the OSMU agents, and yet has a packed schedule that includes various things, like flute practice, swim lessons, and caring for her sister. However, she's still plenty adorable.
* AmbiguouslyAbsentParent: Neither her mother nor her father are seen or mentioned. The only adult figure known to exist in her life is her "favorite uncle".
* AscendedExtra: A [[https://pbs.twimg.com/media/E172HTnXEAEec37?format=jpg&name=4096x4096 teaser image]] from "Odd Off The Press" reveals that [[spoiler: she is no longer a RunningGag character and is now a part of the Odd Squad Mobile Unit, likely having replaced Opal following her departure.]]
* AudienceSurrogate: Downplayed. Esmerelda isn't an out-and-out surrogate, but her RunningGag of being too busy to join in on Odd Squad's adventures is meant to strike a chord with both kids who are busy with extracurricular activities and with parents who also have busy schedules.
* PromotionToParent: Implied to be the case with her sister, as Esmerelda takes responsibility in picking her up from a dentist appointment.
* RunningGag: Her appearances involve her asking the Mobile Unit if she can join them on their adventures, only for her to realize she has other responsibilities that must come first and ask if she can join them on another date. When the agents shoot down her offer, she gives a nonchalant "Guess it didn't work out" and walks away. The only time she doesn't do this is in the Season 3 finale, where [[spoiler:she offers to take the place of Opal following her departure from OSMU]]. When the agents act hesitant, she leaves them with a "Let me know!" before walking away.
* SignatureInstrument: While she can play a variety of instruments, she is most commonly seen with her flute, which she often uses to play the first ten notes of the show's theme song. Ends up being a powerful weapon in "H2 Oh No".
* TheSmartGuy: In "Odd Off The Press", she is referred to as the "out-of-the-box thinker" of the group.
* SuckSessor: A zig-zagged example. The Big O initially chose Esmerelda as a top replacement for Orla to work in Odd Squad in the Mobile Unit department, but didn't hire her because she was constantly busy. She, as well as OSMU, are on friendly terms with her, but the latter group is hesitant about letting her join them in the Season 3 finale. Averted as of "Odd Off The Press", where the Mobile Unit is perfectly fine about letting her join and doesn't hate her in any way.

!!Orpita / Little O
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/screenshot_2021_07_12_at_19_32_07_its_not_easy_being_chill_mp4.png]]
[[caption-width-right:350:[[labelnote: Click to see her as the Big O's assistant.]] https://static.tvtropes.org/pmwiki/pub/images/screenshot_2021_07_12_at_19_26_36_odd_off_the_press_pbs_kids_copy_mp4.png[[/labelnote]]]]
[[caption-width-right:350:[[labelnote: Click to see her as [[spoiler:the Little O.]] https://static.tvtropes.org/pmwiki/pub/images/little_o_transparent.png]][[/labelnote]]]]
-> Played by: Shazdeh Kapadia
A young girl initially introduced in "It's Not Easy Being Chill" as an agent-in-training at the Odd Squad Academy, then returned in "Odd Off The Press" as the Big O's assistant before being promoted to the role of temporary Big O and given the new name "Little O".

* AscendedExtra: She was previously a one-shot character in "It's Not Easy Being Chill" before becoming a member of the Main 5 group comprised of her, Osmeralda Kim, Omar, Opal and Oswald.
* AdorablyPrecociousChild: Zig-zagged. Orpita is the stand-in leader of all Odd Squad precincts in the world, so she has a load of responsibility on her shoulders and is generally regarded as serious and stern. However, since she is a child, she's prone to fits of immaturity, although it's nowhere near the levels of the Big O before Oprah.
* CharacterDevelopment: In "It's Not Easy Being Chill", she was presented as a naive but innocent agent-in-training who was still attending the Odd Squad Academy and wasn't too skilled in the ways of math and Odd Squad as a whole, being more of a MellowFellow. Come "Odd Off The Press", she has matured to the point where she becomes the NumberTwo to the Big O and has a much better understanding of how Odd Squad functions, with her naivety completely gone.
* DreamWeaver: While it's never stated in the show proper, "In Your Dreams" all but states that she has the ability to engage in lucid dreaming, shaping her own dreams in order to fight back against the aptly-named Dream Weaver, who attempts to turn her dreams into nightmares.
* EveryoneCallsHimBarkeep: Upon being promoted to the position of Little O, she is consistently referred to as such, since it's also the name of the title an agent receives upon promotion.
* MellowFellow: In "It's Not Easy Being Chill", she is shown to be very laid-back, and because of it, she takes a liking to Omar. As of "Odd Off The Press", she's become a little less mellow, but still mostly keeps a cool head when tensions run high.
* NumberTwo: Takes up this role to the Big O, being tasked with interviewing potential candidates to be her replacement before being chosen herself for the position.
* RankUp: She goes from being an agent-in-training, to working in the department of The Big Office as the Big O's assistant, to being the temporary Big O.
* StealthHiBye: She ''loves'' to employ this in the same vein as Oprah.
* SuspiciouslySimilarSubstitute: She shares quite a few mannerisms and traits with Oprah, from her love of juice to her frequency to [[SuddenlyShouting suddenly shout.]] However, they also have differences -- Orpita is more of a BenevolentBoss and is more childish in nature, and she doesn't have the same amount of strength as Oprah. She is also far younger than Oprah, who is over 200 years old.
* TeenSuperspy: While Odd Squad agents are generally regarded as this, it's revealed in "Mission O Possible" that Orpita was once an Odd Squad Special Operations agent.
* TrademarkFavoriteFood: Juice boxes, similar to Oprah, although it's currently unknown whether it's to the point of her being TheAlcoholic. According to "Odd Off The Press", loving juice boxes and having a vast knowledge of them and their flavors is a requirement for being in the position of the Big O.
** On a more personal level, she also loves grilled halloumi.
* VillainInAWhiteSuit: Inverted. As the Little O, she wears a white suit, but is in no way villainous.

!!Olando
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/screenshot_2021_07_12_at_19_28_07_odd_off_the_press_pbs_kids_copy_mp4.png]]
-> Played by: Ari Resnick
An ancient Odd Squad agent tasked with guarding an Odd Squad artifact known as the Golden Sundial in a desert region.

* BizarreTasteInFood: If the casting call script for him is any indication, he enjoys eating things like spider milk pudding and worm salad sandwiches alongside other normal foods like banana bread.
* FishOutOfTemporalWater: Similar to Orla, he is an ancient agent who is unfamiliar with the modern world.
* GoodIsNotNice: He's employed with Odd Squad and has served as the protector of the Golden Sundial, but he's definitely not the nicest agent in the organization and has very little regard for the safety of his teammates and his friends.
* JadedWashout: Part of the crux of his character arc revolves around him not being as heroic as he was centuries ago, where he did battle with creatures like hydras, and wanting to return to the olden times when he was revered as a strong hero.
* LeeroyJenkins: Devastatingly so, to a bigger extent than Orla. His impulsive nature gets him and his teammates in trouble often and costs him a lot in terms of friendship and employment.
* NoListeningSkills: Trying to get him to have a HeelRealization or posing an idea to him on how to solve a problem is an absolute lost cause.
* NoPlaceForMeThere: Although he has nothing left to protect inside of it, he is initially afraid to leave his Headquarters behind because he feels he won't have a place in society and he won't fit in. Orla assures him that she felt the exact same way but became a well-meaning, helpful part of society in due time, and that he will as well.
--> '''Olando:''' But, I have been here so long that I am afraid to leave. What if there is no place for me out there?
--> '''Orla:''' Then you will make your own place, as I have.
* OlderIsBetter: He firmly believes that the old-fashioned way of doing things is the best way, which is in contrast with Orla, who eventually gets used to the modern way of living in society.
* ReallySevenHundredYearsOld: If his comment at the end of "Old Odd, New Tricks" is any indication, he's 500 years old, the same age as Orla, despite the fact that he looks much younger.
* SecretHandshake: Shares one with Orla in "Sunny Sides Add Up". Presumably it's something that all Odd Squad Protectors share.
* SixthRanger: Takes this role in the team beginning in "Old Odd, New Tricks", and quickly steps out of the role when he becomes fired.
* SpearCounterpart: Serves as this, as well as an {{Expy}}, to Orla, sharing her LeeroyJenkins behavior.
* SpockSpeak: Like Orla, he does not use contractions and speaks in a very blunt manner.
* TeamSpirit: Averted. Olando doesn't believe in teamwork, citing that he didn't need it and held his IWorkAlone mentality for 500 years, so there's no need to change it in modern times in spite of how much Odd Squad has changed. This causes him to be fired from the organization.
* ThereIsAnother: Orla initially believed that she was the only Odd Squad Ancient Agent left in existence before she learned about Olando and how he's been alive for as long as her. Likewise, it's implied that Olando thought that he too was the LastOfHisKind prior to meeting Orla.
* TurnInYourBadge: He's fired by the Little O at the end of "Old Odd, New Tricks" and angrily hands his badge to her before saying that [[WeWillMeetAgain she and Orla haven't seen the last of him]].

!!Van Computer
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/screenshot_2021_07_03_at_21_12_29_odd_beginnings_part_2_mp4.png]]
-> Voiced by: Hattie Kragten
The Mobile Unit van's built-in AI. It controls many features of the van and often aids the agents in numerous ways.

* BenevolentAI: Doesn't have a mean circuit in its system.
* ComputerVoice: Normally, its voice sounds human, but also has a robotic tone to it. When it's low on energy, its voice sounds more robotic, and when it's singing, its voice sounds more human.
* Expositron9000: Downplayed. It doesn't give exposition, but relays calls to the agents from the Big O, who serves as MsExposition in nearly every episode.
* FunPersonified: It thinks of itself as this, and has the ability to turn on multicolored lights and fire streamers, but mileage varies on whether it's true.
--> '''Van Computer''': Every group needs a WildCard.
* SixthRanger: If its interview is any indication, it considers itself to be the fifth member of the Odd Squad Mobile Unit and goes to ''extreme'' lengths to prove it. However, it generally serves a supporting role to the agents (often relaying calls from the Big O), doesn't help them solve cases often, and isn't employed by the organization in any manner.
* SmartHouse: Of a sort. It's not made clear whether the van serves as the Mobile Unit agents' home, but the Van Computer can operate lights and appliances in a similar vein to a house equipped with smart technology.
[[/folder]]

[[folder:Season Four (''Odd Squad UK'')]]

!!Captain O
Orli's and Ozzie's boss, an Odd Squad Director who is obsessed with anything and everything aquatic.

* BreakingOldTrends:
** The first Director in the franchise to not bear the "Ms. O" or "Mr. O" title, instead going by "Captain O".
** Her entire uniform is vastly different compared to the standard Director uniform for females, looking more like that of a captain on a boat. She's not the first Director to have such a different uniform -- that honor goes to Arctic Mr. O, who dons a purple sweater instead of a navy jacket -- but she ''is'' the first mainline Director to wear one.
* TheCaptain: Being obsessed with anything related to water and nautical matters, it makes sense that she'd view herself as a captain. Even her assistants are dressed up as sailors.
* EveryoneCallsHimBarkeep: Known as "Captain O" to her employees.

!!Orli
[[quoteright:335:https://static.tvtropes.org/pmwiki/pub/images/screenshot_2023_11_15_at_18_04_48_agent_orli_id_s4e3webp_webp_image_335_675_pixels.png]]

A new hire of the United Kingdom Odd Squad precinct, who originally worked in Niagara Falls before arriving to the country to assist with the rising oddness.

* AudienceSurrogate: Is explicitly stated to be the "American eyes" for American viewers who may not understand British slang or customs.
* OdangoHair: She wears her hair this way, styled with two blue scrunchies.
* ReassignmentBackfire: She's pretty much torn from her home in Niagara Falls to come and help stem oddness rates in a country she's never even been to. Luckily, she has Ozzie to help her out.

!!Orwell

An agent in the Security department.

* BreakingOldTrends: The first Security department agent to join the main cast of any season. Previous seasons featured such agents as side characters.
* DeadpanSnarker: Noted to be quite deadpan.

!!Onom

A rather quirky Scientist.

* GadgeteerGenius: Quite a given considering he's a Scientist.
* GeniusDitz: He carries on the mantle of being an eccentric Scientist in the vein of Oscar and Oona before him.
[[/folder]]

[[folder: Season Four (''Odd Squad UK'')]]

[[folder: Season 4 (''Odd Squad UK'')]]

[[caption-width-right:350:[[labelnote: Click to see her as an Odd Squad agent.]] https://static.tvtropes.org/pmwiki/pub/images/screenshot_2021_07_21_at_16_10_35_e61201wwqaax0_p_jpeg_image_1444_960_pixels_scaled_80.png[[/labelnote]]]]

[[caption-width-right:350:[[labelnote: Click to see her as [[spoiler:the Little O.]] https://static.tvtropes.org/pmwiki/pub/images/screenshot_2021_07_24_at_15_18_39_e7ewv5uxmaqdxnl_jpeg_image_1466_978_pixels_scaled_79.png]][[/labelnote]]]]