Mervyn Pumpkinhead is Dream's jaded, wise-cracking, cigar-smoking janitor. As his name implies, he has a pumpkin for a head, and his overall appearance is similar to that of a scarecrow combined with a jack-o'-lantern. He resembles Jack Pumpkinhead of L. Frank Baum's Oz books.

Mervyn apparently drove a bus in dreams for a time during Dream's extended absence, and is first seen briefly in the Preludes and Nocturnes Passengers issue, when Morpheus travels through the dreams of others, "I travel briefly by bus...I sit at the front and talk to the driver."  The driver of the bus was a pumpkin headed, cigar smoking figure.

Mervyn is in charge of the construction, maintenance, and demolition work in the Dreaming, though he sometimes complains that his job is superfluous since Dream can change any of it at will.

Mervyn Pumpkinhead

Mervyn was one of the few who actively took up arms to fight the Furies in The Kindly Ones and was destroyed. He was returned to existence by the new Dream in The Wake

In a past incarnation, shown in The Wake, Mervyn was seen to have had a turnip for a head instead of a pumpkin, since pumpkins were not known in Europe in the distant past.

One issue of the "Dreaming" spin-off comic, focuses on a dreamer who enjoys working under Mervyn's supervision.