The Cartoon Network press kit character descriptions describe Lazlo as "imaginative, freethinking," and a "natural-born conformist." The press kit states that Lazlo "enthusiastically spreads mischief and wacky shenanigans," uses "imagination and creativity" to solve problems, and vex Scoutmaster Lumpus with his "persistent happiness and optimism." The Hollywood Reporter reviewer Ray Richmond described Lazlo as "energetic." Science Fiction Weekly reporter Kathie Huddleston describes Lazlo as "optimistic" and "out to wreak as much good-natured havoc as he can." Common Sense Media reviewer Joly Herman, whose review is posted on Go.com, says that Lazlo possesses "innocent rebellious quality of a trickster" since "authority" is often his adversary, and that Lazlo does not "take him seriously," with "him" being Lumpus. Lazlo stays in the Jelly Cabin with Raj and Clam the three are called the "Jelly Cabin Trio." Murray said that he did not plan for Alazraqui to voice Lazlo according to him the arrangement simply occurred. Originally, Murray wanted Lazlo to carry a strong Brazilian accent, but when Cartoon Network asked Murray to choose only one character to carry a strong accent, Murray opted for Raj and gave Lazlo an Americanized voice. Murray wrote on his website that Lazlo's parents moved to the United States to start a fruit company, allowing Lazlo to learn English. According to Murray, when he thought about Lazlo's personality, a spider monkey came to his mind. As he developed the concept, Murray believed that a children's book could not contain the stories and ideas, so he decided to create a television show. Joe Murray, creator of Camp Lazlo, originally created Lazlo for a children's book concept. He is the main protagonist of the series. Lazlo "goes where the wind blows" by his own statement. Lazlo has a really serious case of coulrophobia. Carlos Alazraqui voiced Lazlo (like Rocko from Rocko's Modern Life). Often annoying Edward, he is a very happy-go lucky monkey.
He is an adventurous, optimistic and quirky Brazilian spider monkey.