is originally an Old Norse word meaning “story” or “epic tale”. It has immigrated into English by way of The Icelandic Sagas
, which were first translated into English in the 19th century.Etymology ramble
Since then, “saga” in English has the meaning of a long, epic
story, sometimes with the subtext “long-winded”.
Titles containing "Saga" most often come in the format "(The) X Saga" (the article is optional). X is sometimes the protagonist, but can be practically anything — though usually a proper name or a noun. “Saga” is simply attached at the end, treating the whole title as a compound term.
In the original Norse sagas, there was always a genitive case involved — mostly of the type "<Protagonist's> saga" or "Saga of <the protagonists>".
A third, rare variant is "(The) <adjective> Saga" (not always clearly distinguishable from the first type).
This kind of title usually lampshades that the work is a series of more-than-average length and/or has a considerable number of instalments.
Examples of the The X Saga type:
Anime and Manga
Examples of other types (with genitive or adjectives):