Fan fiction often takes existing characters and puts them in new and unexpected situations. In the case of 'bill kills hank fan fiction', it might be that the author wanted to explore a more extreme or alternate storyline. It could be that the writer was dissatisfied with the original relationship between Bill and Hank in the source material and decided to create a scenario where Bill kills Hank. This could also be a way to introduce new plot elements, such as the consequences of Bill's actions, how other characters react, or even a possible resurrection or redemption arc for either character.
One possible fan fiction could be about Hank being a father figure to Connor. In this story, Hank could teach Connor about the intricacies of human emotions. He might show Connor how to handle difficult situations in a more 'human' way, like dealing with loss or disappointment. This could strengthen their bond and help Connor better integrate into human society.
I'm not sure specifically as it could be a very specific fan - created story. It might involve the character Bill in some sort of scenario where he kills Dipper. Maybe it's a dark take on the relationship between these two characters within the context of the original work's universe.
One possible theme could be the exploration of death and the afterlife. Since a mortician deals with the dead, it could be used as a vehicle to discuss different beliefs and ideas about what comes after death, perhaps with Hank Green's influence adding a unique perspective.
I'm not sure specifically what that 'hank pass the broccoli rogue fan fiction' is about as it could be very unique to the creator. It might involve a character named Hank and some sort of situation with passing broccoli in a rather 'rogue' or unexpected way within the context of a fan - made story.
The Bill Cipher triangle can also be a way to connect different plotlines in fanfic. For example, one group of characters might be researching its history while another is trying to stop it from being activated. This creates a complex web of storylines that all revolve around this one mysterious triangle.
There may not be a huge amount of widely - known Hank Green Mortician fan fiction. However, you could start by reaching out to Hank Green's fan communities. They might be able to point you in the direction of any such fan - created stories. Maybe someone has been inspired by his work and the idea of a mortician and combined them in a unique narrative.
One interesting plot could be that Hank and Connor find out that there is a prophecy or some kind of pre - determined plan involving Connor and his father. They initially don't believe it, but as they encounter strange events and meet mysterious characters, they start to think there might be some truth to it. This could lead to a race against time to either fulfill or prevent the prophecy, all while their relationship as a 'father - son' like duo deepens.
You can try fanfiction.net. It has a large collection of various fan fictions, including those related to Hank and Connor. Just use the search function to look for them specifically.