Creator: Paul Neary
Artist who, during Mark Gruenwald’s run on Captain America, c0-created the Serpent Society and several members including Diamondback, Bushmaster and the Asp, as well as Flag-Smasher, Armadillo, Black Crow, Battlestar (the black Bucky), and U.S. Agent. He also won an Eisner for his work on the British book 2000AD, and several Eagles.
Captain America #308 (1985): Secret Wars II; 1st Armadillo
Mark Gruenwald: Two issues, two new creations (Madcap and Armadillo). True, they never really caught on like a Lee/Kirby creation, but it’s pretty impressive for a new guy to try twice in a row.