I'm curious to learn whether any of the original Bat-characters created by Frank Miller in his seminal THE DARK KNIGHT RETURNS book have ever made it to canon (Post-COIE, New52, Rebirth) by being adapted from Earth-31.

And if not, would you, as a Batfan, want them back adapted for the current canon? And if so, how?

In particular:

1. Carrie Kelley (Robin)

2. Ellen Yindel (Police Captain then Commissioner)

3. Dr. Bartholomew Wolper (anti-Batman psychiatrist)

4. Abner (Joker's husky bomb-making henchman)

5. Mutant Leader (PRE-COIE precursor to Bane?)

6. Bruno (Criminal, gun-toting, topless with swastika-pasties, tall, muscular buzz-cut henchwoman)

Would/could any of these memorable characters make their way to Main Earth and how should they be adapted to fit in?