Legion Wiki:Glossary
Adult Legionnaire
A term used, mostly in post-Zero Hour comics, to credit people who contributed to the writing of the comic in question without being contractually entitled to a full writing credit, in reference to the apocryphal Pre-Crisis Adult Legion stories.
Initially used in Legionnaires #22 to credit Tom McCraw and Mark Waid for their contribution to an officially Tom Peyer-written story, which had been continued from the McCraw and Waid-written Legion of Super-Heroes v4 #65 (a similar credit for Peyer in LSH65 being entered as "Plot Assist Lad"), it was used only occasionally until Roger Stern's wife, Carmela Merlo, began aiding Stern in his plotting of issues while he wrote Legionnaires #45 [1]., whereupon she began being credited as "Adult Legionnaire" from Legionnaires #48, and continued to be listed as such until the end of Stern's run on Legionnaires in Legionnaires #77, as well as one of the stories in Legion of Super-Heroes #100.