| Character Information
Leslie is gentle and while he can be hyper and creepy (similar to Banana Joe), he seems to be intelligent and wise. He can also be 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. He often says malapropisms (e.g., using "grapefruit" when he meant "grateful").
Leslie is a pink flower, similar in appearance to a daisy, 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, and he uses them as feet.
- "Early reel": He fills up with Masami's tears and sprays pollen at Rocky. Implying that he's allergic, Rocky then sneezes, causing Leslie's petals to fall off.
- "The Third": Leslie tries to be Gumball and Darwin's third friend.
- "The Quest": Leslie picks up Anais' Daisy the Donkey doll after Tobias let it fall out of the window and onto the road.
- "The Pressure": Leslie is seen with The Treehouse Girls throughout the episode.
- "The Ghost": Leslie shrivels up and collapses after smelling Gumball's "ghost-proof" breath.
- "The Mystery": After seeing Principal Brown all wrapped up and dirty, he remarks that he "Smells like manure."
- "The Gi": Leslie joins the rest of the school in mocking the Gi-clad Gumball and Darwin.
- "The Party": Teri accompanies Leslie to the party, suggesting that he might like her.
- "The Picnic": Leslie is on the field trip with the rest of Miss Simian's class.
- "The Club": Leslie is seen as a member of the synchronized swimming club along with Darwin, Penny, and the Dog.
- "The Mustache": He is on the dodge ball team in the School Gym.
- "The Meddler": Leslie is seen in the boys locker room in the shower with Gumball and Darwin.
- "The Fight": Leslie is seen cheering on Gumball and Tina's fight.
- "The Fridge": He was seen playing the saxophone on Gumball's flashback.
- "The Flower": He starts hanging out with Penny, making Gumball jealous.
- "The Apology": He is shown losing his petals after looking at Miss Simian's butt.
- "The Words": Leslie 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.
- "Christmas": He appears in the Christmas is Cancelled number.
- "The Bumpkin": In the school playground.
- "The Sidekick": He can be seen through the class door at the beginning, and is seen later in the cafeteria.
- "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 started the storm and also in the cafeteria at the end.
- "The Dream": He is seen in Miss Simian's class.
- "The Photo": He is seen waiting in the line at the beginning of the episode.
- "The Game": He is seen in Mr. Small's class.
- "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's then seen at the end as one of the angry civilians attacking The Wattersons.
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- He is one of two male characters that look and sound feminine, the other being Alan.
- It is revealed in "The Flower" that he is Penny's cousin.
- Leslie plays the flute in the school band.
- In the European Spanish translation, he is often treated as a girl.
- In Season 2, Leslie gets eyebrows.
- In the early reel, Leslie's petals are blue.
- According to the episode "The Flower", Leslie does not have his own bedroom.
- Although Leslie is a boy, in the episode "The Pressure", he was seen in the all girls club.
- In the Mexican Spanish dub, Leslie is a female. It has since been corrected in season 2.