One interesting plot idea could be a time - travel scenario. Imagine Ranma or Ryoga going back in time and having to deal with the events that led to their current situation. It could add a whole new layer of depth to their characters.
Another idea is a fanfic that focuses on a swapped - curse situation. What if Ranma's curse was transferred to Ryoga or vice versa? This would not only change their physical forms but also how they interact with the other characters. It would be interesting to see how they adapt to this new situation and how the other characters react to them. This plot could also explore themes of identity and acceptance in a unique way.
One idea could be that they have to deal with the challenges of impending parenthood while still having their usual identity - switching mishaps. For example, Ranma might switch into his female form at an inconvenient time during the pregnancy, causing all sorts of comical and yet heart - warming situations as they figure out how to handle it together. Another plot could be that Ryoga discovers a new sense of responsibility and tries to build a proper home for their future family, all while Ranma is dealing with the physical and emotional changes of pregnancy.
One idea could be that Girl Ranma and Ryoga are forced to team up for a school project. They initially bicker a lot, but as they work together, they start to understand each other better. For example, Ranma might learn about Ryoga's insecurities when it comes to his sense of direction, and Ryoga could see that Ranma is not as tough as she seems on the outside.
One great Ranma x Ryoga fanfic could be 'The Unlikely Bond'. It explores their relationship in a unique way, delving into how their constant rivalries gradually turn into a deep understanding and something more. It has some really interesting character development scenes.
The theme of redemption can also be found. Sometimes, one of them makes a mistake or has a flaw that needs to be overcome. Through their relationship, they are able to find a way to redeem themselves. It could be Ranma making up for being too cocky or Ryoga for his over - competitiveness, and their bond helps them in this journey of redemption.
Another good one could be 'The Bond Between Them'. This fanfic explores how their rivalry gradually turns into a deeper connection. It shows their growth as characters, starting from their constant fighting to slowly understanding and supporting each other. It's a heartwarming read for fans of the pairing.
I'm sorry, but I can't recommend lemon (suggestive or inappropriate) fanfics as they often violate content policies. However, you can look for general Ranma and Ryoga fanfics on fanfic platforms like FanFiction.net or Archive of Our Own. There are many great ones that focus on their friendship, rivalries, and adventures without inappropriate content.
Some dedicated Ranma 1/2 fan communities might also have their own collections or recommendations. You can join forums or groups related to Ranma 1/2 and ask fellow fans if they know of any good Ranma x Ryoga fanfics.
A possible plot for a 'Ranma 1/2' pregnant fanfic is that it's a result of some magical mishap. This could lead to a search for a way to reverse it, but during that time, Ranma and Akane (or whoever is involved) start to bond in new ways. They could learn more about each other's fears and hopes for the future. Or perhaps it's a plot where an enemy discovers the pregnancy and tries to use it against them, forcing them to come up with creative ways to protect themselves and the unborn child.
One possible plot twist could be that their families oppose the marriage at first. Maybe Ranma's father has some old feud with Ryoga's family that they need to overcome. Another twist could be that a third character, who has feelings for either Ranma or Ryoga, tries to break them up. For example, Akane might realize she still has feelings for Ranma and tries to stop the wedding.
Some non - lemon fanfiction themes for Ranma and Ryoga include their adventures in the martial arts world. They could be on a quest to find a rare martial arts technique or to defeat a powerful opponent. Also, there are stories that center around their daily lives at school or in the village. How they deal with school bullies, or how they interact with other characters in the village like Akane or Shampoo. These themes can create really engaging and family - friendly fanfiction stories.