Walter Gibson
Walter Gibson is credited as writer on 54 issues in grailworth's catalog, 34 issues of them across 10 series we value. Characters first seen in issues they wrote or drew include The Avenger, Ham, Algernon Heathcote "Smitty" Smith and Fergus "Mac" MacMurdie.
Characters they introduced
Every issue
Batman (1940) 1 issue
Nightmare (1970) 1 issue
Space Adventures (1952) 1 issue
Space Detective (1951) 1 issue
Strange Adventures (1950) 2 issues
The Thing (1952) 2 issues
Credits from the Grand Comics Database, CC BY-SA 4.0.