Rowley appears to be wider than Greg. He has 6 strands of hair, sticking downwards in a curved way. Rowley never has appeared with his mouth closed, leaving him with an open happy face, or sad happy face.
Like Greg, Rowley is interested in video games. He is interested in a singer named Joshie, which Greg states is for 6-year-old girls. Rowley has a girly diary that was given to him for his birthday.