Wilhelmina Dagmar "W.D." Merkles is a tomboyish girl around D.W.'s age that appears in "Best Enemies." Their parents thought they would get along perfectly, but they turn out to like completely different things. W.D. likes racecars and broccoli, and doesn't believe in unicorns. She has an imaginary friend named Maxine who is an anthropomorphic elephant. Just like Nadine, Maxine gives W.D. advice. W.D. actually follows her advice, unlike D.W. with Nadine.