| Leonard Daniels
| Character Information
He is a yellow-colored lightbulb-shaped man with black hair. He wears a light blue shirt, along with a red tie. He also wears white underwear instead of wearing pants. He has a black mustache, and a black mole, as well.
He is pretty friendly, and willing to help out complete strangers without too many qualms, as showcased in both "The Awkwardness" and "The Cycle." He also seems to be pretty patient, not minding the abuse he endures due to Gumball's and Hot Dog Guy's antics, along with Harold's cruelty.
- "The Awkwardness": He makes three appearances: the first time is on the city bus, the second time is in the bathroom, and the third time is outside the mall, where Gumball tosses him in the trash.
- "The Console": He can be seen at the park.
- "The Cycle": He becomes Harold's butler.
- "The Ex": He tells Gumball he does not mind cutting his brakes.
- "The Uncle": He appears on the plane.
- "The Worst": His picture appears on the Employee of The Month board.
- "The Deal": He is seen at the Rainbow Factory.
- "The Line": He is one of the people in line for Stellar Odyssey.
- "The List": He is on the plane in Elmore Maps.
- "The Sucker": He is shown presenting the cake to Julius's parents.
- "The Cringe": He appears in a flashback.
- "The Neighbor": He is kicked out of the mall's elevator by Gary.
- "The Anybody": His scooter is taken by Gumball. He later appears watching Stellar Odyssey in the cinema.
- "The Faith": He is part of the crowd at Elmore Stadium, and joins Milk Guy and several others in supporting magic over embroidery.
- "The Shippening": He is shipped with Doctor Literature by Sarah.
- “The Founder”: He works at Chanax.
- ”The Schooling”: He gets a haircut.
- “The Intelligence”: He dunks Mrs. Robinson.
- ”The Understanding”: He runs out of the bank.
- One of his early designs resembles his voice actor Mic Graves.
- There is a recurring gag where he runs into Gumball, Gumball ignores him, and the conversation ends with him saying "I don't mind."
- Leonard's name is revealed in "The Deal" during the Nicole Rap.
- He was also revealed to be the Employee of the Month in the Rainbow Factory.
- He is the second character to be named after Daniel Lennard, the first being the Watterson kids' imagination.
- According to "The Shippening," he is shatterable.