I think Simon Petrikov, or Ice King as he is known in some states, could be a main character. His backstory is deeply intertwined with the events that might have led to the Great Mushroom War. Also, Lady Rainicorn could be important as she is Jake's girlfriend and might have some unique perspectives on the events of the war.
Finn is likely to be one of the main characters. He's a central figure in Adventure Time, so he'd probably play an important role in the fanfic related to the Great Mushroom War. Jake could also be there, as Finn's best friend.
Princess Bubblegum might be a main character too. Her scientific knowledge and leadership skills could be relevant in the context of the war. Marceline, with her long life and experiences, would also be a strong candidate for a main character in this fanfic.
Finn and Jake would be obvious choices. Their courage and friendship could be put to the test in the harsh post - war world. They might be on a mission to help the survivors or to uncover the secrets of the war.
In the context of The Great Mushroom War story in Adventure Time, Finn and Jake are key. Finn, as the human boy, and Jake, his shape - shifting dog friend, are constantly coming across remnants of the war. Marceline, the vampire, also has a connection. She's old enough to have some memories or knowledge about the events of the war. Plus, there might be some other characters from the past that are only hinted at, who were involved in the power struggles that led to the Great Mushroom War.
It really depends on the specific fanfic. But often, there are survivors who become main characters. They could be ordinary people before the war who now have to be heroes. Maybe there's a young adult who has to lead a group of survivors to safety.
The Great Mushroom War in Adventure Time is a really interesting part of the story. It's this huge event that happened in the past. It was so destructive that it changed the world completely. The land was scarred, and new species emerged from the chaos. We know that there were probably different factions fighting, but we don't get all the details. There are hints that there was some sort of scientific and magical arms race that led to the war. The characters in the present day, like Finn and Jake, are living in a world that's still trying to recover from this cataclysmic event. They find old bunkers, strange weapons, and other things that are remnants of the pre - war civilization, which gives us little glimpses into what the world was like before the Great Mushroom War.
Definitely Finn and Jake. Since they are the main characters in Adventure Time, they are a natural focus in Mushroom War fanfiction. Their heroism and the way they face the challenges left by the war are great to write about. But Princess Bubblegum also pops up a lot. Her scientific mind and leadership in the post - war Candy Kingdom can be a big part of many stories. And let's not forget Simon Petrikov, who has a deep connection to the events of the Mushroom War through his past as the Ice King.
One idea could be exploring the origin of the Mushroom War in more detail. Maybe there are some hidden causes or events that led to it. Another could be focusing on the characters' lives before the war and how it changed them. For example, how Finn's family was affected.
Often, Finn and Jake might make appearances in Adventure Time Gum War fanfic as they are main characters in the original series. They could be involved in the Gum War in various ways, like trying to stop it or getting dragged into it. Princess Bubblegum is also likely to be a main character as she has a lot to do with gum.
You could write a fanfic about how the Mushroom War affected the magical elements in the Adventure Time world. Maybe the war disrupted the balance of magic, and certain characters are on a quest to restore it. They might encounter strange new magical creatures or phenomena that were born out of the chaos of the war.
A young and naive character who grows throughout the story can also be very memorable. They start off being scared and helpless but through their experiences in the post - war world, they become a strong and resourceful individual. Their transformation is inspiring and makes them stand out among the other characters.
In many 'pokemon the great adventure fanfic', you'll often find a central trainer character. This character could be a novice just starting out on their Pokemon journey. They may be joined by their best friend or sibling, also a trainer. Additionally, there could be a mysterious character that the main trainer meets along the way. This character could have a hidden agenda or be a key to unlocking some great mystery in the Pokemon world. And of course, the Pokemon that the trainer catches and befriends are also important main characters in their own right.