"AprilSeven" wrote:I read in more than one place that the Japanese custom is to keep sagas such as Astro's going until the main character dies.
Because Astro is a robot, he could conceivably live "forever" - so Tezuka created this episode to give closure to the "official" story of Astro with the intention that the audience would "move on."
They did NOT, however, and basically were relentless in their demands to bring Astro back. His "Once upon a time" series was a way to "bring him back" but also to have the opportunity to "update" him. Not a successful move, on his part!
This is exactly what I remember being the dynamics of the situation involved in the decision of killing off Atom in the 1960s anime. Tezuka wanted to do other things however he couldn't because of the Astro Boy anime, but how things were in Japan at the time a story was only over when there was nothing more to tell, which often involved the deaths of the story's heroes.
Killing off heroes is something that hasn't been fairly consistent or permanent in the comic book world (this includes manga). Back in the 1990s DC Comics DID actually kill off Superman (as Dragon stated) but that was only temporary as they revived him only a year later. His comics did continue on though and a new character was born from his death; Superboy aka Kon-el.
There have been other instances as well in DC comics of them killing off characters only to bring them back to life (Batman, Superboy, Kid Flash/Impulse, the second Robin [although he was dead for almost 20 years before the writers brought him back]).
This makes some fans edgy because it seems like some writers aren't taking their heroes seriously, many feel that if a character dies they should STAY DEAD and never be brought back unless there is a "good enough" reason to do so.

I'd go into some other instances of character death but I am mostly versed in Tezuka's comics and comics by DC (I apologize for that).
It's a touchy subject all across the board I think and it's never possible to please every fan of a comic when it comes to 'ending' something. Comics hardly 'end' with a death now. It didn't work back then and it still to this day doesn't work. It's very difficult now to kill a hero (and sometimes a villain) and makes sure that they stay dead. Death is now treated as a tool for marketing I think.