Alexander bears a near resemblance to Shaggy Rogers from Scooby Doo who had short hair in a full fringe as the color of his hair is dark brown as a contrast to his twin sister, Alexandra who had black hair. He has black eyes and wears his black sunglasses with purple lining where he conceals his eyes.
His primary appearance, 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 pinstripped pants and brown shoes.
In Josie and the Pussycats 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 their ties to save the Earth's destruction at the hands of the sorcerer portrayed by Dick Dastardly who manages to transform his sidekick Muttley into a giant dragon to make rampage into the city.