One idea could be a joint emergency situation where a building fire is also a crime scene. Maybe the arsonist is still on the premises and the teams from both Chicago PD and Chicago Fire have to work together. The PD has to search for the suspect among the chaos and the firemen have to put out the fire while also trying not to destroy evidence.
Voight from Chicago PD would be really interesting. He has a strong personality and his no - nonsense attitude would contrast well with the more team - oriented and often more laid - back firefighters. His detective skills could also be crucial in solving a crime that intersects with a fire - related situation.
Voight would be a great character to feature in a crossover. His tough - as - nails attitude and unorthodox methods would make for interesting interactions with characters from other shows. Another good one is Halstead. He's smart and resourceful, and could easily adapt to different situations in a crossover. For example, if it was a crossover with a medical show, he could be the one trying to communicate with the medical staff about the details of an injury related to a case.
One idea could be a crossover with another police drama, like 'Law & Order'. The characters from Chicago PD could team up with the detectives from 'Law & Order' to solve a case that spans both cities. Another idea is a crossover with a superhero show. Maybe a superhero comes to Chicago and the PD has to work with or around this new element. For example, if there was a crossover with 'The Flash', the fast - running hero could help the PD catch a super - fast criminal that they couldn't handle on their own.
One great thing about Chicago PD and Law & Order: SVU crossover fanfiction is the unique character interactions. Writers can bring together the tough cops from Chicago PD and the specialized detectives from SVU. For example, they might create a scenario where a case starts in Chicago but has ties to New York, leading to a joint investigation. This allows for some really interesting dynamics as the characters from different shows with different methods have to work together.
One great 'chicago pd fanfic' is 'The Blue Line Bonds'. It delves deep into the relationships between the characters outside of their regular work scenarios. The character development is on point and it gives a fresh perspective on the show's dynamics.
Another plot could involve a human trafficking ring that operates between the two cities. SVU has some experience with these types of cases in New York, but the Chicago PD has its own intel on the local side of things. The two teams have to combine their resources and knowledge to take down the entire ring. This would involve a lot of undercover work and tense moments as they try to rescue the victims and arrest the criminals.