Thank you, guys!
I knew Green Lama originated in radio shows and pulps, but as I don't know how to find these, copyrighted sources won't be selected.
Besides, my plan is to use characters that fit into a magic universe, as the comic I currently do hinges on magic - I finally banned superheroes from my work (my girlfriend and collaborator works on a superhero comic and I prefer to help her, because I'm simply non-satisfied with my own superhero stuff) . Stardust being a super-"wizard", I think he can be of good use. No origin story, well it suits me - I also think he doesn't need one. Concerning Green Lama, I plan to split him into two characters - the Green Lama and Jethro Dumont. The Claw is already in use, first as a phantom menace - keeping his powers from Silver Streak Comics) - but definitely non-human. And he is the arch-enemy.
Well, all the characters are given a magic twist, but I try to be as faithful as possible to the original characters.
Plans for Black Terror and Daredevil - among others - are still in development for further use, they won't be a part of my "magic comic".
Anyway, I won't twist them too much.