In the thirty-three years that have passed since the publication of CRISIS ON INFINITE EARTHS, *most* of the characters who were a part of the Pre-COIE DC Multiverse have returned in some form or another to appear in the Post-COIE DCU. Which characters (not counting one-offs) have NEVER made the transition over?
All I'm coming up with is King Kull, an old Marvel Family enemy from the Fawcett Comics days who made a number of appearances during the Pre-COIE Bronze Age after DC acquired Fawcett's properties and began publishing new adventures of the Marvels in the 1970s, but who hasn't been seen or heard from after COIE.
Buried Alien (The Fastest Post Alive!)