Ken is usually seen wearing a green and white button down shirt with a pocket on the right hand side. He also wears a grey, green and blue necktie. He seems to be in his late 30's or early 40's but still has a full head of blond and gray hair.
He‘s extremely energetic and seems to have a child like mind, as he gets very excited about almost everything, especially cartoons. He wants his son Jimmy to call him "Mr. Roberts" at school but he almost never succeeds. Towards the end of the movie, he becomes a more responsible person by getting dressed before he gets in the car, which was a reoccurring event in the film.
- His first name was revealed in the Episode "Friends."