Morpheus

Haunting the pages of Marvel's Moon Knight since his 1998 debut, Morpheus is one of those shadowy figures who feels tailor-made for the eerie, psychological corners of the Marvel Universe. Created by Doug Moench and Tommy Lee Edwards, this Modern Age villain emerged right alongside the relaunched Moon Knight series, sharing the page with Marc Spector, Jean-Paul Duchamp, and Scarlet Fasinera — a cast that signals just how deep into Moon Knight's atmospheric world this character belongs. With appearances stretching across a remarkable 25 years through 2023, Morpheus has proven surprisingly resilient for a figure with a relatively small footprint, a testament to how effectively he fits the unsettling tone of his home series. If you're diving into Moon Knight back issues, this is exactly the kind of compelling, era-defining antagonist worth keeping an eye out for.