I'm just starting to read his work, I haven't really gotten a lot of perspective on his style.
The same group that picked up Violence Jack has started releasing chapters of an obscure Go Nagai series called
Iyahaya Nantomo, seems worth giving a try. Even better, they also added
Ashita no Joe, picking up where the last Manga Editors left off.
I read one of the strangest old manga I have ever seen last night:
Human Clock. It was released in a pulp magazine in 1962 by what amounts to a hack mangaka. Ostensibly about the son of a clock maker who turns into a clock, the story is so incoherent, the art so erratic that what would have been a prosaic horror story is turned into a twisted, surreal, unintentional exploration of a warped mind. Character design and line work don't stay consistent from one frame to the next, the characters rarely even look human. The story proceeds with no logic, seeming to be more the ravings of a schizophrenic. The reality was that the author was a failing mangaka churning out quickie manga, living from pay check to pay check. By the time he wrote human clock he was essentially giving the middle finger to his readers, punishing them for rejecting his work. Human Clock is a good example of outsider art in manga, and an early (unintentional) example of heta uma (so bad it's good, an underground style of deliberately poor art. see Tokyo Zombie or I'll Give it My All..... Tomorrow).
Comipress has a great article about Human Clock mangaka Tokunan Seiichirō
here. It's part of there Manga Zombie translation, a 1997 book about the pre-Dragonball manga hinterland.