Stuff
Stuff (no secret identity; Vigilante's sidekick) appears in 20 issues in grailworth's catalog, and was first published in 1942. First appearance: World's Finest Comics #246 (1941), cover dated 1977.
First appearance
Every appearance we value
Western Comics (1948) 1 issue
World's Finest Comics (1941) 3 issues
Character appearances from the Grand Comics Database, CC BY-SA 4.0.