There's one character that I hope DC brings back is JACK COLE's PLASTIC MAN. He's a great character in the DC UNIVERSE. I fell in love with the hero when he had his own Saturday Morning Cartoon in the early 1980s.
He's a classic JACK COLE PLASTIC MAN tale from the Golden Age that originally appeared in QUALITY COMICS' POLICE COMICS #51. It featured a cool villain named the GRANITE LADY, that sadly only appeared once. The contrast of his pliability against her indestructible granite body would've made her a interesting recurring villain foe him the face.