
Isayama sensei is writing a horror manga series, this is not the typical case where good characters live and bad ones die, tihs is a much bigger work than that, this is like reality.When the time comes, though it'll break many hearts including mine, if Levi has to die, the mangaka won't hesitate.

your thinking of tragedy, which attack on titan also is, but that's beside the point
in horror alone, people can needlessly die, but the main characters are safe, it becomes tragedy when main characters can also be killed/are killed, which can be separate from horror and apply to other things, though generally horror will always involve tragedy, not necessarily the other way around... i guess think game of thrones in that sense, but anyways
i think the mangaka would hesitate, there's probably a lot of people that would drop the manga/anime if levi died, at least that being my guess given his ridiculous amount of popularity, and if people drop, they'll lose money, and that's where the mangaka's writing is going to go towards, almost always, that's pretty much a given, and it doesn't look like this author is george r. r. martin, pretty sure that guy gets off on killing peoples favorite characters... but i think even he'd have to bend to certain pressures of his audience sometimes
aside from that though, isn't levi kinda... too bad ass to die? i just don't feel like there would be an easy or simple way to kill him, even if people were plotting to kill him in some complex scheme that hinders his abilities, it almost doesn't seem possible with levi, i could only see him dying towards the very end as a sacrifice of some sort, and even then, it still feels like he'd still somehow turn out on top...

Exactly! Writers very rarely kill off favourite characters, especially ones as big as Levi. There is a lot of pressure from editors and publishers to avoid pissing readers off (I work in the publishing industry, so I know: readers come first). And I agree: it would take a lot to kill off Levi. In fact, I wouldn't be surprised if he was the last one standing at the end.

i also completely forgot, his name is derived from "revive" (can't remember the language(s) though), it'd actually be pretty cool if we see the author take that play on words and make it real
in that sense, i could definitely see the author killing him, if only to bring him back somehow and make his name more literal
And some people think Levi will die in the main series? Not gonna happen. He gets his own spin off series and many, many readers will rage if he's killed. It's probably in shoujo manga because Levi has so many fangirls. ╮( ̄▽ ̄)╭