So, would any of these concepts have succeeded in 1930s Hollywood?
(Disclaimer: I haven't actually seen/read all these concepts, but I
think I know enough about them to answer the question.)
> Black Lagoon
Given the popularity of both gangsters and pirates, it might have
worked in the 30s (albeit with a lot of retooling).
> Avatar: the Last Airbender
Martial arts weren't that popular then.
> Witch Hunter Robin
Maybe; horror was popular in the 30s.
> Girl Genius
It's similar enough to the pulp fiction of the time that it might have
had a chance.
> Mahou Sensei Negima!
Fantasy wasn't popular then.
'
> Heroes
Maybe, considering that superheroes were just emerging then, but would
the special effects of the day been able to do the concept justice?
> Magical Girl Lyrical Nanoha
See "Negima".
> Firefly
Probably not. Most 30s sci-fi was strictly in the Flash Gordon/Buck
Rogers mode.
> Neon Genesis Evangelion
See "Firefly".
> The Terminator
Maybe if the Frankenstein-like aspects were emphasized.
> Gargoyles
It's just pulpish enough that it might have had a chance.
> Ranma 1/2
Given that everyone else has commented on this extensively, I have
nothing to add.
> Boondocks
Are you kidding? Seriously, the *only* chance this would have in the
30s is if they made Uncle Ruckus the star.