| Character Information
Leslie is a pink flower who stays grounded in a blue flowerpot. He has a thin green stem coming out of the pot which he uses to move his head around and two long leaves extend from his stem, which are used as his arms. Green stubby roots pop out under his flowerpot, which he uses as feet. The inside of his mouth is colored purple, and his tongue is red. In season 2 onwards, he acquires eyebrows, like most other characters who received redesigns in the new season. In some instances, such as when Leslie hallucinates in "The Petals," his eyes are blue, but in "The Triangle," they appear green. In the early reel, Leslie's petals are colored baby-blue instead, and, in one prototype image, his tongue is as well. In "The Awareness," it is revealed that Leslie is actually a dandelion when he loses his pink petals.
Leslie is gentle and, while he can be hyper and creepy (similar to Banana Joe), he seems to be intelligent and wise. He is also very effeminate and hangs out around the Treehouse Girls, possibly because Leslie is great at giving relationship advice. He plays the flute in the school band. Many people confuse him for a girl due to his feminine traits and his name. Most flowers are hermaphroditic, so it is possible he may actually be female to some degree. He often says malapropisms (e.g., using "graceful" or "grapefruit" when he meant "grateful," or "condensation" instead of "conversation"). He appears to be a multi-instrumentalist; he is seen playing the violin in "The Sidekick," the saxophone in "The Fridge," and the flute in "The Triangle." In "The Petals," it is also revealed that he is quite the fashionista, to the point of having had a haute-couture "high fashion phase," and is obsessed with his image to the degree of narcissism and vanity.
- Early reel: He fills up with Masami's tears and sprays pollen at Rocky. Implying that he is allergic, Rocky then sneezes, causing Leslie's petals to fall off.
- "The Third": He tries to be Gumball and Darwin's third friend.
- "The End": He is seen in Miss Simian's classroom.
- "The Dress": He joins the other students in glorifying Gumball while he wears the wedding dress.
- "The Quest": He picks up Anais' Daisy the Donkey doll after Tobias lets it fall out of the bus window and onto the road.
- "The Pressure": He is part of the Treehouse Girls.
- "The Ghost": He shrivels up and collapses after smelling Gumball's "ghost-proof" breath.
- "The Mystery": He joins the rest of the students in solving the mystery.
- "The Gi": He joins the rest of the students in laughing at Gumball.
- "The Kiss": He is seen cheering for Gumball.
- "The Party": Teri accompanies him to the party.
- "The Robot": He talks with Molly in the cafeteria.
- "The Picnic": He is on the field trip with the rest of Miss Simian's class.
- "The Sock": He is in class.
- "The Genius": He is in the library.
- "The Mustache": He is on the dodge ball team in the gym.
- "The Club": He is seen as a member of the synchronized swimming club along with Darwin, Penny, and the Dog.
- "The Ape": He can be briefly seen in the schoolyard.
- "The Curse": He is in the cafeteria.
- "The Meddler": He is seen in the boys' locker room in the shower with Gumball and Darwin.
- "The Fight": He is seen cheering on Gumball and Tina's fight.
- "The Fridge": He is seen playing the saxophone in Gumball's flashback.
- "The Flower": His first major role. He starts hanging out with Penny, making Gumball jealous.
- "The Banana": He is seen in Mr. Small's class.
- "The Apology": He is shown losing his petals after looking at Miss Simian's butt.
- "The Words": He gets yelled at by Darwin when Gumball is trying to force Darwin to tell Leslie how annoying he is. Leslie is on the telephone and one of his petals gets blown off in the strong wind of Darwin's yelling.
- "The Skull": He is on the school bus.
- "Christmas": He appears in the "Christmas is Cancelled" number.
- "The Bumpkin": He is seen in the schoolyard.
- "The Virus": He briefly appears in the library, playing a computer game.
- "The Hero": He can be seen on the bus.
- "The Dream": He is seen in Miss Simian's class.
- "The Sidekick": He can be seen through the class door at the beginning, and is seen later in the cafeteria.
- "The Photo": He is seen waiting in the line at the beginning of the episode.
- "The Storm": He is first seen in the cafeteria at the beginning, then in the schoolyard talking to Penny, then outside Principal Brown's office when Masami starts the storm and also in the cafeteria at the end.
- "The Game": He is seen in Mr. Small's class.
- "The Voice": He apologizes quickly to Gumball and Darwin, then runs off.
- "The Promise": He is seen riding the school bus.
- "The Boombox": He jumps rope with Penny and Carmen, and is later seen naked.
- "The Tape": He appears in one of Gumball's videotapes.
- "The Sweaters": He is seen in the school cafeteria.
- "The Internet": He is one of the students laughing at Gumball's embarrassing viral video.
- "The Finale": He appears on the bus of students that Kenneth eats. He is then seen at the end as one of the angry civilians attacking the Wattersons.
- "The Fan": He is seen outside the school.
- "The Coach": He is seen in the school gym, and later in the cafeteria.
- "The Joy": He is one of the victims of the Joy virus.
- "The Recipe": He appears in swimming class.
- "The Extras": He is seen outside the school.
- "The Fraud": Darwin knocks him out of school, landing in Gary's car.
- "The Void": He and the other girls fall over during cheerleading practice.
- "The Move": He appears in the cafeteria.
- "The Allergy": He appears in the school hallway.
- "The Mothers": He can be seen in class.
- "The Shell": He can be seen during (or after) the school play event, carrying a tree prop by the dressing room.
- "The Burden": He walks by Darwin talking to Chris Morris and says hi to him.
- "The Bros": He can be seen walking in the cafeteria.
- "The Mirror": He is inside Miss Simian's classroom.
- "The Pizza": He appears as one of the citizens attacking the Wattersons.
- "The Lie": He listens to Gumball talk about Sluzzle Tag, and is in a scene where Gumball gives him red high heels as a gift from Sluzzle Dude.
- "The Butterfly": He can be seen inside Miss Simian's classroom.
- "The Saint": He is in a flashback.
- "The Safety": He is one of the students who watch the safety video in horror.
- "The Society": He is one of the secret society's members.
- "The Spoiler": He jokingly reveals the plot of The Screamening to Gumball and Darwin in the cafeteria.
- "The Countdown": He and other alternate versions of him appear in Miss Simian's classroom.
- "The Triangle": His second major role. When Darwin takes his solo spot in the school marching band, Leslie becomes jealous of him, sabotages his instrument, and even attempts to attack him during the performance.
- "The Return": He appears on the school bus, and is later in Miss Simian's classroom.
- "The Others": He can be seen talking to Tina in the hallway.
- "The Check" He appears in Darwin's mind when he is wondering what it would be like if he had money.
- "The Pest": He appears in the cafeteria during Gumball and Billy's fight.
- "The Gift": He gives Masami a gift.
- "The Upgrade": Bobert weds him to Alan.
- "The Comic": He sings LaserHeart's theme song in the hallway.
- "The Romantic": He plays the violin while Gumball waits for Penny.
- "The Hug": He is seen in the school hallway.
- "The Wicked":
- "The Traitor": He stops Gumball from attacking Alan in a flashback.
- "The Origins": He is seen running up, accidentally kicking Gumball's fish bowl.
- "The Girlfriend": He runs away from Jamie and can later be seen in the cafeteria.
- "The Advice": He makes a cameo appearance in the school halls.
- "The Parasite": He is seen talking with Tobias in the school hall.
- "The Bus": He is on the hijacked school bus.
- "The Night": He appears in Teri and Juke's dreams.
- "The Blame": He is seen at the library and during "Books Are Violent."
- "The Slap": He gets angry at Tobias for slapping him on the butt.
- "The Fury": He is seen outside of the school talking to Colin.
- "The Compilation": He sings along to "Weird Like You And Me" in the cafeteria.
- "The Scam": He appears in Miss Simian's classroom and later at the cafeteria.
- "The Disaster": He watches Gumball go through the Void.
- "The Rerun": He is seen when Rob stops time.
- "The Stories": He gets hit by a dodge ball thrown by Jamie.
- "The Guy": He is seen in the schoolyard talking to Carmen.
- "The Boredom": A wheel from the tire cuts him in half.
- "The Vision": He can be seen in the schoolyard.
- "The Code": He is in the cafeteria.
- "The Test": Gumball throws a bat at him during a game of baseball, knocking him out.
- "The Loophole": He leaves class with the other students.
- "The Potato": He is seen in class in a flashback.
- "The Console": He attacks Gumball, Darwin, and Anais and notifies them of the Awesome Store.
- "The Catfish": He is seen in Miss Simian's classroom.
- "The Grades": He is seen in Miss Simian's classroom at the end.
- "The Ex": He is in the hallway when Darwin freaks out about his hat.
- "The Sorcerer": He is seen in the cafeteria.
- "The Uncle": He is seen in Miss Simian's classroom.
- "The Worst": He is in the classroom.
- "The Petals": His third major role. Gumball and Darwin try to help him keep his beauty when he begins wilting.
- "The Best": He is seen in the schoolyard.
- "The Singing": He is seen in Miss Simian's classroom.
- "The Line": He gets blasted by Bobert.
- "The List": He starts to play his flute, but gets pushed away by Gumball.
- "The One": He is attacked by Tobias and decapitates himself after being tricked into thinking he was buying discount handbags. It is later revealed that he was never actually harmed.
- "The Cringe": He is in Miss Simian's class.
- "The Anybody": He is seen leaving Miss Simian's class at the end of the day.
- "The Faith": He is part of the crowd at Elmore Stadium, and joins the milk guy and several others in supporting magic over embroidery.
- "The Candidate": He is part of the group of kids locked in school.
- "The Pact": He is wilted by Miss Simian's bad breath. He later hears Principal Brown confess he and Gumball's pact over the intercom.
- "The Shippening": He runs into a sign when Sarah begins writing in the magic notebook.
- "The Spinoffs": He talks with Clayton and Carmen.
- "The Ghouls": He sings "All Hail All Hallow's Eve!" Later, he goes trick or treating with Alan.
- "The Awareness": His fourth major role. Gumball's plant-insensitivity causes problems with him, making Leslie go to extreme lengths to make him reveal that he does not know anything about plants.
- "The Drama": He makes Gumball doubt Darwin and Carrie's relationship.
- "The Buddy": He is beaten up by Jamie in a flashback. Later, he is in class. Later, he is in the schoolyard. He is also caught on tape.
- "The Agent": He talks to Gumball and Darwin.
- "The Web": He is on Elmore Plus.
- "The Mess": He wants to kiss Gumball and Darwin.
- "The Decisions": He is in the hallway.
- "The Inquisition": He is turned into a human.
- Kerry Shale (US/UK)
- Andrea Kerekes (Hungary, season 1)
- Lehel Kisfalusi (Hungary, season 2–present)
- Michael Bauer (Germany)
- Rosane Corrêa (Brazil, seasons 1–3)
- Evie Saide (Brazil, season 4–present)
- Nallely Solís (Latin America, season 1)
- Circe Luna (Latin America, season 2–present)
- Janusz Wituch (Poland, season 1)
- Wojciech Słupiński (Poland, season 2–present)
- Jihan Malla (Arab World)
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- It is revealed in "The Flower" that he and Penny are cousins.
- Due to his feminine appearance and behavior, he has been referred to as a female in many countries:
- In the European Spanish translation, he is often treated as a girl.
- In season 1, Leslie was a female in the Mexican Spanish and French dubs. This was corrected in season 2.
- In the Brazilian dub, Leslie referred to himself as a female in "The Party."
- According to "The Flower," Leslie does not have his own bedroom.
- The fact that Leslie is a male character with an effeminate appearance and personality could be a reference to the fact that plants technically do not have a gender.
- It is revealed in "The Origins" that when he was younger, his face was covered, as he was not bloomed.
- Leslie is good at dancing, as shown in "The Triangle."
- It is also his "power" in "The One."
- Leslie is the only male character who is a member of the Treehouse Girls.
- He is still fully conscious whenever his head is removed, as shown in "The Petals."