What is lenny on laverne and shirley?

Lenny Kosnowski is one of the main characters on the television show Laverne & Shirley. He is played by actor Michael McKean. Lenny is portrayed as a sweet and somewhat naive man who hangs around with his best friend and coworker, Squiggy. The two of them often show up uninvited to Laverne and Shirley's apartment, where they deliver their trademark greeting: "hello" (followed by a high-pitched "di-di-di-di-di").

Lenny and Squiggy work at the Shotz Brewery with Laverne and Shirley, and their silly antics often provide comic relief on the show. Lenny is known for being a well-meaning but hapless character, and he frequently gets into trouble because of his gullibility and trusting nature. Despite his flaws, however, he is a loyal friend and a popular character with fans of the show.