Which Looney Tunes director created the character Marvin the Martian?

Chuck Jones created the Looney Tunes character Marvin the Martian.

Marvin first appeared in the 1948 Bugs Bunny cartoon Haredevil Hare. He was designed as a quiet, highly controlled extraterrestrial antagonist whose plans often involved destroying Earth because it obstructed his view of Venus.

His costume is a comic visual reference to ancient warfare: a Roman-style helmet and skirt sit above a small, ant-like body. The character originally had no visible mouth, so his personality depended heavily on posture, gestures, and Mel Blanc’s restrained voice performance.

Marvin was not actually named in the original theatrical shorts. In The Hasty Hare, released in 1952, he was called the Commander of Flying Saucer X-2. The name Marvin the Martian became standard later through publicity and subsequent Looney Tunes productions.