Big Bob Pataki is a fictional character from the animated television series Hey Arnold!. He is the father of the main character, Arnold, and is known for his larger-than-life personality and distinctive appearance, which includes a large mustache and a robust build. Bob is a proud and hardworking man who runs a local restaurant called Pataki's Diner. In the show, Big Bob often displays a mix of humor and stubbornness, reflecting his strong opinions and dedication to his family. He has a complicated relationship with his wife, Miriam, and his daughter, Helga, which adds depth to his character. Bob's antics and interactions contribute to the show's themes of family and community.