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Characters / Dexter's Laboratory Secondary Characters

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     Mee Mee and Lee Lee 
Voiced by: Kimberly Brooks (Mee Mee), Kath Soucie (Lee Lee)

  • Asian Airhead: Lee Lee is Asian and she and Mee Mee are often depicted as being just as ditzy as their friend Dee Dee.
  • Black Best Friend: Mee Mee is black and one of Dee Dee's friends.
  • Chuck Cunningham Syndrome: Neither of them are anywhere to be seen in the third and fourth seasons.
  • Color-Coded for Your Convenience: In later episodes, Mee Mee wears purple and Lee Lee wears green.
  • Pink Means Feminine: Both wear the same pink dress as Dee Dee.
  • Spell My Name with an "S": In an early set of promotional training cards depicting scenes from the series, cards for their first appearance in "Double Trouble" spelled their names as "Li Li" and "Mimi." The credits for their second appearance in "Tribe Called Girl" spelled them the way their known today.
  • Straight Man: Are occasionally shown as being more rational and intelligent than Dee Dee, if only by a smidgen.
  • Theme Naming: Their names rhyme with Dee Dee.
  • Those Two Girls: They usually appear together as foils to Dee Dee.

Voiced by: Dom De Luise

  • All of the Other Reindeer: It is shown in the episode "Koosalagoopagoop" that everyone else in the Land of Koos dislikes him, though this changes at the end of the episode.
  • Big Fun: He's a huge and obese creature and really loves to have fun.
  • Blatant Lies: Whether he's downplaying his ability to change size or insisting he's king of Koosland, he's a bit of a chronic liar.
  • Classy Cane: Briefly carries one when we first see him.
  • Easily Forgiven: As far as any of his fellow imaginary beings are aware, he socked the king of Koosland in the face, took his crown, and kissed the queen. The king immediately forgives him for it.
  • The Friend Nobody Likes: Dee Dee adores him, but Dexter's justifiably annoyed by him and he's resoundingly disliked in the Land of Koos. He makes a brief cameo in the Powerpuff Girls, where nobody likes him except Bubbles.
  • Lethal Chef: He's exceedingly proud of his "Pepe wraps" — an industrial sized tub of meat slapped unseasoned onto a tortilla. And if you don't eat it willingly, he'll shove it down your throat.
  • Nice Guy: He's very friendly and even attempts to get Dexter and the grumpy Peepers to lighten up.
  • Nice Hat: He wears a little green hat.
  • Signature Laugh: Has a distinctive, wheezy one that goes hand in hand with being voiced by Dom De Luise.
  • Tulpa: He's Dee Dee's imaginary friend and has pretty much become a physical being ever since Dee Dee created him.
  • Took a Level in Badass: In his first appearance he doesn't do much but bounce around, giggle, and make a nuisance of himself; in the second, he lies to Dee Dee to make himself look more impressive and likable and mostly gets dragged around by her. By the third, however, he's willing to steal Dexter's robot mecha to save Koosland — and, with Dexter, deliver a Shut Up, Hannibal! to the anime villain destroying it.
  • Unexplained Recovery: His first appearance had Dexter imagine him away, supposedly gone forever in one hell of a Mood Whiplash Downer Ending. Obviously he would make recurring appearances afterwards, with no explanation how he was brought back, other than Dee Dee's perenially active imagination.

     Lisa the Babysitter
Voiced by: Kath Soucie

  • Hartman Hips: Due to the art style, lots of women in the series have Hartman Hips.
  • Ms. Fanservice: She has a slender but curvy figure.
  • Nice Girl: Lisa is shown to be very kind and friendly, and is evidently very good with children, seeing as she's a part-time babysitter.
  • One-Shot Character: She only appears in a very early episode of the series and never shows up again after that. But look up any fanart of her and you'd be surprised at how much of it there is.
  • What Happened to the Mouse?: It is unknown if Jeff and Lisa got back together after Dexter broke them up.
  • Zettai Ryouiki: Wears thigh-high socks along with a navy-blue skirt.

     Douglas E. Mordecai III 
Voiced by: Tom Kenny

     Action Hank 
Voiced by: Michael Armstrong ("Beard to be Feared"), John Garry ("Decode of Honor"), Kevin Michael Richardson ("911")

Voiced by: Rob Paulsen

Gary is a bully at Dexter's school.

     Professor Williams 
Voiced by: Paul Williams


     Mandark's Parents (Windbear and Oceanbird)
Windbear, Oceanbird, and Mandark as a baby.
Voiced by: Jeff Bennett and Kath Soucie

  • Abusive Parents: While they're not the worst examples of the trope, they aren't very supportive of Mandark's love for science, and they gave him a name Susan that would subject him to a lot of ridicule from other kids. Mandark's father also is the first to actively attempt to shut down Mandark's scientific pursuits and displays anger problems when things don't go his way.
  • Amazingly Embarrassing Parents: Not only are they hippies, but they had the audacity to name their son Susan, which eventually helped to push him into his evil tendencies.
  • Berserk Button: Windbear gets mad exactly once, in "My Dad vs. Your Dad", when Dexter's dad makes fun of his hippie lifestyle.
  • Bourgeois Bohemian: Downplayed. They're both pretty conventional for hippies, living in the suburbs with their nuclear family. However, they are completely hippie-esque otherwise, and only left their commune for Mandark's sake.
  • Does Not Like Shoes: They always go barefoot, just like the utmost stereotypical hippies you can think of. Mandark did not take after them.
  • Granola Girl: Oceanbird.
  • Hippie Parents: Mandark's real name is Susan, because they wanted to give him a name that fit "beyond the confines of society" and one without "preconceived connotations" as befitting their highly liberal views.
  • Nature Lover: A couple of hippies connected to the earth who lived in a little woodsy village called Flowertopia with Mandark before moving to the city.
  • New-Age Retro Hippie: They missed the 60s by at least a decade or two, but you'd never be able to tell just by looking at them.
  • No Celebrities Were Harmed: John Lennon and Yoko Ono, Windbear more so.
  • Not So Different: Windbear at least ends up getting provoked into fighting Dexter's dad just like their sons do. Oceanbird is only implied, and even then it could end up the same as Dee Dee and Lalavava where they give up on it.
  • Unwitting Instigator of Doom: As the aforementioned tropes demonstrate, their questionable parenting ultimately didn't do their son very many favors, but it was naming him Susan that in his youth would finally push him over the edge.

     Yani the Janitor 
Voiced by: Tom Kenny

  • Almighty Janitor: A literal case.
  • Badass Mustache: It's a pretty impressive one about the size and shape of a push broom.
  • Didn't Think This Through: The final phase of his revenge involves him littering the cafeteria floor with potato chips and throwing ketchup packets and forks at Dexter. Apparently it didn't dawn on Yani that by doing so would cause an even bigger mess than what Dexter could make, and thus resulting in more work for Yani. He also forgot the fact that he would still be coming home late and his wife would be pissed.
    • When you also think about it, Yani's also committed multiple crimes - including kidnapping and aggressive battery - in his attempt to get revenge on a student at the school he works at. If, or more accurately, when the school and the authorities would find out about this, he'd lose his job and likely even get arrested. Then, his wife would be even more angry than before.
  • Freudian Excuse: Being abused by his wife.
  • Gone Horribly Wrong: He ends up making a bigger mess in his attempt to get revenge on Dexter.
  • Henpecked Husband: Part of his motive for trapping Dexter in the school is that he was abused by his wife.
  • Jerkass Has a Point: While he did trap Dexter, Dexter did keep leaving a mess in the school laboratory, causing him to be overworked.
    • Subverted, given that his reaction was, instead of going to the school board or simply asking Dexter to be mindful of what he leaves behind, to commit kidnap him and hold him in the school against his will. Keep in mind that Dexter is mentioned in one episode as being only eight years old. Overkill would be an understatement here.
  • One-Shot Character: Only appears in the episode "Trapped With A Vengeance". It's very possible he got fired and even arrested after what he did to Dexter, so this might be a justified case.

     Darbie High Priestess 
Voiced by: Tom Kenny
  • Evil Old Folks: She seems to be an elderly woman and she's a nasty piece of work to boot.
  • Expy: She's meant to be a parody of the Vulcan Minister T'Pau from the Star Trek: The Original Series episode "Amok Time"
  • One-Shot Character: She along with her fellow Darbie collectors only appear in the episode "Star Check Unconventional" where they were the main antagonists.
  • Oh, Crap!: When she sees that Dexter is about to chuck the turple at her Darbie doll.
  • Serious Business: Removed a Darbie doll from it's box? That's grounds for a serious beating in her eyes.
  • Trrrilling Rrrs: "A box was opened... There must be... Rrretribution."

     Large Dealer 
Voiced by: Rob Paulsen

     The Dodgeball Bullies 
Voice by: Rob Paulsen (The Thin One and Fat One) Kath Soucie (The Short One)


     Olga "Lalavava" Astronomonov 
Voice by: Eddie Deezen

  • Annoying Younger Sibling: Bullies her older brother, Mandark, and bosses him around.
  • Creepy Child: She is a Tiny Tyrannical Girl who likes dark and depressing scary things.
  • Dramatic Thunder: Thunder strikes whenever someone says her name "Lalavava".
  • Enfant Terrible: Even Mandark is afraid of her.
  • Evil Counterpart: To Dee Dee, a short and solemn performer to Dee Dee's tall and joyful performer; while Dee Dee unwittingly destroys Dexter's creations but truly loves her brother, Lalavava bullies Mandark mercilessly and displays little to no care for him.
  • Girlish Pigtails: Has a bowl cut similar to Mandark's but with long pigtails on top.
  • Not So Different: After Olga and Dee Dee's ballet performance using their brothers' giant robots fails to please the audience, they both agree that science stinks and end up hanging out together as friends.
  • One-Shot Character: Only appears in the episode "Dee Dee's Rival" and is never seen again even after Mandark's parents are revealed.
  • The Rival: To Dee Dee in the art of ballet.

Example of: