Perhaps there could be a story where Dodger and Georgette go on an adventure outside of the city. They encounter different animals and challenges along the way. They might have to find food and shelter in the wild, and in the process, they learn more about each other and strengthen their friendship.
It could develop through shared experiences. For instance, if they both get lost in a new part of the city. They would have to rely on each other to find their way back. This would make them realize how much they need one another, and gradually, feelings of friendship could turn into something more like love.
Another storyline might involve Laurel getting pregnant and Oliver being overprotective. He tries to keep her out of danger, but Laurel is determined to continue her work as a hero. This could lead to some tension between them as they both have strong opinions on how to handle the situation while also dealing with the reactions of their friends and family.
One possible storyline could be that Oliver Queen is transported to the wizarding world during a fight in Star City. He stumbles upon baby Harry Potter and realizes the importance of protecting him. He then has to learn about the wizarding world quickly to keep Harry safe from the dark forces. Another storyline could be that the wizarding world somehow contacts Oliver for help in protecting Harry. Oliver brings his skills and knowledge from his own world to the task.
A great plot for Oliver and Company fanfiction could be that the group stumbles upon a time - traveling device. They accidentally get sent back in time to when the city was first founded. There, they meet the ancestors of the current animals in the city. Dodger has to figure out how to get them all back to their own time while also dealing with the differences in the way animals lived back then. They might also have to avoid being caught by the early settlers who don't understand that they are intelligent animals.
One common storyline could be the reactions of his friends and family. For instance, how Diggle would react to this unexpected situation, whether he would be supportive or shocked. Another could be Oliver's struggle with the physical changes and the new responsibilities that come with pregnancy.
There could also be a storyline where they decide to start a family. This would bring in elements of how they would raise a child in a world full of danger and how their relationship would change and grow with the new addition to their family.
One idea could be a modern - day retelling where the human characters take on the roles of the animals in Oliver and Company. For example, a street - smart kid could be Oliver, trying to survive in a big city. Another could be a story where the human characters form a rescue team to save the animals from an evil corporation that wants to use them for experiments. And a third idea might be a story about a human who befriends the animals and together they go on a musical adventure across the city.
One common theme is friendship. Just like in the original Oliver and Company, new OCs often form deep friendships with the existing characters. For example, an OC dog might become best friends with Oliver. Another theme is survival. Since many OCs are often strays or new to the city, they have to learn how to survive in the tough urban environment. And also, the theme of family. Sometimes an OC might find a new family among the characters of Oliver and Company.
Maybe a story where they discover the pregnancy in an unexpected way. Like, they were on a mission together and Chloe starts feeling unwell. After some tests, they find out she's pregnant. Then it could be about how they break the news to their friends and family in Smallville. Lois might be overly excited and Clark could offer his support in a very Clark - like, selfless way.
In some fanfictions, there's a time - travel element. Fem Harry Potter goes back in time and meets a younger Oliver Wood. They end up changing the course of Quidditch history at Hogwarts together. This allows for a lot of creative exploration of the characters' personalities and how they might have interacted in different circumstances.