Well, the canon status of MK comics isn't straightforward. It might be canon within certain story arcs or universes, but not across the board. Different interpretations and continuities can come into play.
Well, a popular 'Raiden Shogun Fanfic' is 'Raiden's Trial'. It tells the story of how the Shogun faces a series of challenges that test not only her strength but also her wisdom. It's an exciting read with lots of action scenes. Then there's 'The Shogun and the Sakura Tree'. This fanfic beautifully weaves the relationship between the Shogun and the symbolic sakura tree of Inazuma. It's a more emotional and introspective piece. And 'Raiden Shogun: The Silent Observer' which portrays her as observing the changes in Inazuma from a distance, and then slowly getting involved in the new developments.
Well, the 'dark raiden story' might be related to a particular series. If Raiden is from a game, for example, the story could be about how he turns dark. It could be due to some external influence like a powerful enemy corrupting him or some internal struggle within him. Maybe he has to face his friends as an enemy in this 'dark raiden story' because of this transformation.
The length of the MK9 story varies depending on how quickly you progress and explore all the elements. But on average, it can take several hours to complete the main storyline.
Well, the duration of the MK11 story depends on your playing style and how much you explore. Generally, it could take anywhere from 8 to 10 hours to finish the main storylines.