One idea could be Tanaka getting involved in a school-wide mystery. Maybe there are strange happenings around the school and his usually listless attitude actually gives him a unique perspective to solve it. For example, he might notice small details that others overlook because he's not caught up in the daily hustle and bustle.
Yes, it's finished. You can enjoy the complete story now.
Well, in this light novel, a key theme is the contrast between Tanaka's listless state and the world around him. It shows how he navigates through school life while being so unenergetic. Another theme could be acceptance. His friends seem to accept him as he is, which is an important aspect of the story.
Ohta, Tanaka's best friend, is also a great character to focus on. His loyalty to Tanaka and his more energetic personality can create interesting dynamics. For example, fanfiction could explore how Ohta tries to get Tanaka more involved in school activities.
Tanaka is obviously the most important character as the story revolves around his listless nature. Then there is Ohta, his friend who often has to deal with Tanaka's lethargy. There are also other classmates who interact with them in various ways.
One idea could be exploring the unspoken stories of the ranch hands. Maybe there's a hidden love affair between two of them that has to be kept secret due to the social norms of 1923. Another could be focusing on how a young character dreams of leaving the ranch and going to the big city, but faces many obstacles. And a third idea could be a mystery plot where strange things start happening on the ranch and the characters have to figure out what's going on.
One idea could be Android 21's struggle to fit into a world that fears her. She has to prove that she's not a threat and tries to make friends. Another could be her discovery of new powers and how she uses them for good. Maybe she teams up with other characters to fight a common enemy.
One idea could be Vampirina making new friends in the human world who are initially scared but then come to understand her. For example, she could join a school club and have to prove that she's not a threat.
Another plot could involve a crossover within the Darksiders universe. Maybe the Horsemen have to team up with a previously unknown group of characters to face a new, greater threat. This could introduce new dynamics and relationships.
Another plot could be a different version of Vision's 'rebirth' in the show. What if there were more glitches and he had to figure out his identity in a completely different way? This could lead to some really cool interactions with Wanda and the other characters.
One idea could be a time - travel plot where Naruto and Sasuke are sent back to their childhood days and have to relive certain events with the knowledge they have now. This could change the course of the entire Naruto storyline.