Leslie is a gentle and overly-friendly flower boy, although there has been discussion about what gender it is, as its appearance in "The Pressure" gives the implication that it is a girl. He is hyper and creepy, similar to Banana Joe , but he seems to be more intelligent than him. He can also be very effeminate and hangs out around The Treehouse Girls. Possibly for this reason, Leslie is great at giving relationship advice. He plays the flute in the school band.
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. To walk around, his roots can be stuck out of the bottom of his pot and used like legs. Like regular flowers, Leslie will get dry and thirsty if he doesn't get water for long periods of time.
- The Party : He was invited to Rachel 's party and played tea parties and got thirsty at the end
- The Pressure : He was with the treehouse girls, making lies having a boyfriend.
- The Kiss : Leslie was cheering Gumball on to forget about Granny Jojo's kisses.
- The Word:Darwin tells Leslie that he was anoying