Donna Maria Puentes

Debuting in the landmark Avengers #300 — a key issue in any serious Marvel collection — Donna Maria Puentes arrived at the dawn of the Copper Age, introduced by the powerhouse creative team of Walter Simonson, John Buscema, and Tom Palmer. Her brief but notable run through the late '80s and early '90s places her in rarefied company, sharing pages with titans like Captain America, Iron Man, and Captain Marvel across the pages of The Avengers, Captain America, and Quasar. She may be a rare presence in the catalog, but any character who steps onto the stage alongside Marvel's heaviest hitters in a collector-significant debut issue is absolutely worth tracking down.