Fukuzawa, the president of the Armed Detective Agency, would be a good character to include. His leadership and wisdom can influence the events involving Soukoku. Higuchi, who is loyal to Akutagawa, can also be added. Her interactions with Soukoku can be used to explore the power dynamics within the Port Mafia. And Elise, Mori's ability manifestation, can add an element of mystery and unpredictability to the fanfic.
Chuuya is not dead in the manga. The author has kept him alive to drive the story forward and create interesting developments. His presence adds a lot of excitement and intrigue to the plot.
Popular shin soukoku fanfics usually have a strong emotional core. They make readers feel the connection between the two characters, whether it's loyalty, love, or just a deep friendship. The pacing is also important. It shouldn't be too rushed or too slow. A good fanfic will have a balance, gradually building up the story. Additionally, the fanfic might incorporate elements from the original work's world - building, like the different organizations in Yokohama. This gives a sense of familiarity and authenticity to the readers.
Most BSD light novels often have complex characters. Since they are based on literary figures, they bring in the depth and complexity of those original personas. For example, a character might have the same traits as a famous writer but with a unique twist for the BSD universe.
Chuuya is a popular character. In chuuya and oc fanfiction, the original character (oc) often interacts with Chuuya in unique ways. It could be a story of adventure where the oc teams up with Chuuya to face various challenges. For example, they might battle against powerful enemies in a fictional city. This type of fanfiction allows fans to explore different relationships and storylines that are not part of the original canon.