Alexander bears a near resemblance to Shaggy Rogers from Scooby-Doo. He has short hair in a full fringe as the color of his hair is dark brown as a contrast to his twin sister, Alexandra who has black hair. He has black eyes and wears his black sunglasses with purple lining which conceal his eyes.
His primary clothing is a green v-neck long sleeve sweater with an orange long sleeve button shirt beneath his sweater and a purple tie on the collar similar to Alan's, purple and black pinstriped pants and brown shoes.
In Josie and the Pussy Cats in Outer Space, Alexander's space suit is identical to Alan's which is a blue space suit with a blue gray collar, blue pants and black boots. His collar design is flat instead of neat and his linings of his sunglasses is white.
- In the Warrior Princess short, Alexander alongside Alan Mayberry and Fred Jones from Scooby-Doo serves as one of the Earth's Key Holders to summon Olive the Warrior Princess with the use of their ties to save Earth from destruction at the hands of the sorcerer portrayed by Dick Dastardly who transforms his sidekick Muttley into a giant dragon to rampage through the city.