I just picked up a neat book at a yard sale. It's called "The Super Dictionary" and was first published in 1978.
Looking through it there were the typical DC heroes such as Batman, Superman and Wonder Woman, but a few DC heroes I've never seen. (And that's pretty strange, since I read a lot of old comics!)
So can anyone out there give me a bit of info (Brief history, significant comic appearances, most recent appearance and super powers) on the following characters:

• SR-12
• Ted & Teri Trapper
• Conjura
• Jonna Crisp
• El Dragon

Come to think of it are these guys even DC characters? Maybe they were just created as filler heroes for "The Super Dictionary."
Your knowledge and wisdom would be appreciated!

UPDATE: While this link isn't official DC lore, it's still a pretty neat springboard for their characters.