Shinra's strength in the manga is quite significant. He's able to overcome various challenges and opponents with his skills and determination. His power keeps evolving throughout the story.
Another storyline could revolve around a shared adventure. Maybe there is a powerful enemy that neither Joker nor Reika can defeat alone. They are forced to team up, and during this time, a romantic connection begins to form. Reika could help Joker see the beauty in the world and the importance of protecting it, while Joker could show Reika a different perspective on things she has never considered before. In the end, they might not only defeat the enemy but also fall in love.
For Joker, his development could start with him being a rather cold and distant character. But as he interacts with Reika, he could become more empathetic. Reika, on the other hand, could start off as a typical Pretty Cure, very positive and idealistic. Meeting Joker might make her more aware of the gray areas in life. For example, she could learn that not all those who seem bad are truly bad at heart. Their relationship could be the catalyst for these changes in their characters.
I'm not entirely sure as 'cloud healthcare shinra fanfic' could be very specific. It might be a fan - created story that combines elements of cloud computing in healthcare and something related to Shinra (which could be from a game, anime etc.).
The theme of discovery is also present in Celty and Shinra fanfic. They are constantly discovering new things about each other and about themselves through their relationship. And the theme of the supernatural world is often explored as Celty is a supernatural being and Shinra is involved in that world. This adds an element of mystery and excitement to their relationship in the fanfics.
I'm not sure specifically what a 'cloud janitor shinra fanfic' is about as it could vary greatly. It might be a fan - created story related to a character named Cloud who is a janitor in the Shinra organization from a particular game or series. Maybe it involves his daily experiences, his interactions with other characters in the Shinra setting, or some sort of adventure within that fictional world.