Al Delvecchio

Al Delvecchio was the drive-in owner and cook of Arnold's Diner from season 4 to season 9. He took over Arnold's after Arnold got married and moved in season 4. Al eventually married Chachi's mother, Louisa. He had a sighing catchphrase of "Yep-yep-yep...". Al and Louisa moves to Chicago with Joanie and Chachi and opened a restaurant in Chicago where Joanie and Chachi perform. Mostly he left half of his company back to Arnold when he move back to Milwaukee. Joanie and Chachi move back to Milwaukee where Joanie goes back to college to become a teacher and Chachi makes it as a musician. Al and Louisa stays in Chicago.^[2]

For much of the series Al would talk about his former love Rosa Coletti and how she left him for a tie salesman. Eventually Al would meet Rosa again in the eighth-season episode, "If You Knew Rosa". She was played by Nancy Marvy.

Al Molinaro as Al Delvecchio made a cameo appearance in the 1994 Weezer music video for their single "Buddy Holly", where the band were portrayed as playing at Arnold's. Molinaro was the only cast member from the show to record new content for the music video, while the rest were edited in through archival footage. The character also made an appearance on the Robot Chicken episode "Celebutard Mountain", but was voiced by Adam Talbot. He also appeared on Family Guy on a stained glass window in the church of "The Holy Fonz" on the episode "The Father, the Son, and the Holy Fonz".