Tyrion Lannister is often a popular character in these fanfictions. His intelligence and complex personality can add a lot to the story. He might befriend Daenerys or even be a mediator between her and Viserys in some alternate universes.
A fanfiction might explore Viserys' relationship with his sister Daenerys in a more in - depth way. For example, it could show how they might have worked together more effectively if Viserys had been less cruel and more strategic. In this fanfiction, Viserys could have been a mentor to Daenerys, teaching her about the history and politics of Westeros.
Another plot might be Viserys traveling back in time. He gets a chance to relive certain events. This time, he decides to be more diplomatic. For instance, he tries to form an alliance with the Starks early on. This could lead to a completely different chain of events in the 'Game of Thrones' universe, with the North and the Targaryens working together against common enemies.
Another theme is family. Just like in the original lore, the relationships with family members play a big role. In these fanfics, a female Viserys might have different dynamics with her siblings, parents or children. Maybe she has to fight against the traditional family roles that are imposed on her. For instance, she could be in a situation where she has to prove herself worthy to her father who doubts a female's ability to rule.
Since I don't have more information about this specific 'Death of a King: The Real Story', I can't say for sure which king it is. It could be any king from history.
One interesting Viserys fanfiction could be one that explores his early days before the events of the show. It might show his relationship with his family in more depth. For example, how he interacted with his siblings and what his dreams were for the future of his house. Another could be a fanfiction where Viserys survives and has to face the consequences of his actions in a different way, perhaps learning from his mistakes and trying to redeem himself. A third could be a fanfiction that delves into a romantic relationship for Viserys that was never explored in the original series, giving a new dimension to his character.
BB King passed away on May 14, 2015. He had been suffering from diabetes and other health problems. His death was a great loss to the music world. He was a true blues legend, and his influence on music will always be remembered.