Michael Moorcock
Michael Moorcock is credited as writer on 81 issues in grailworth's catalog, 26 issues of them across 8 series we value. Characters first seen in issues they wrote or drew include Elric, Xiombarg, Prince Gaynor the Damned and Kulan-Gath.
Characters they introduced
Every issue
Conan Saga (1987) 2 issues
Conan the Barbarian (1970) 2 issues
Giant-Size Conan (1974) 1 issue
Tom Strong (1999) 2 issues
Credits from the Grand Comics Database, CC BY-SA 4.0.