One interesting concept could be the exploration of power dynamics in a darker Zootopia. For example, how different species might abuse their power or be oppressed in a more sinister version of the city. It might also delve into the seedy underbelly of the animal society that was only hinted at in the original movie, like illegal activities among certain groups.
Judy Hopps is often a central character in Zootopia dark fanfiction. Her idealism can be twisted in a darker version. For example, she might start to question her own beliefs when faced with the harsh realities of a corrupted Zootopia. Nick Wilde is also popular as he can be portrayed as either a reluctant hero or a character who has to adapt to the new, darker environment in different ways.
Nick Wilde is often a popular character in dark zootopia fanfiction. His street - smart nature and his past as a con - artist can be explored in darker scenarios. Writers might show him getting dragged back into his old ways due to some external pressure or a personal vendetta.
Some dark zootopia fanfiction might also focus on the psychological toll of living in a society that seems so perfect on the surface but has hidden problems. Characters could struggle with depression or anxiety, like Judy Hopps realizing that her dream job isn't all she thought it would be and having to deal with the corruption and darkness she discovers within the Zootopia Police Department.
A 'savage dark zootopia fanfiction' might be centered around a breakdown of the order in Zootopia. It could show how the normal rules and harmony are disrupted. Maybe there's a group of animals that start to rebel against the system in a violent way, or there are some hidden forces at work that are trying to turn Zootopia into a more chaotic and dangerous place. It could also explore the individual characters' darker sides, like what would make a normally friendly character turn aggressive or vengeful.
One possible plotline could be a mystery where a series of disappearances occur in Zootopia. The main character, perhaps a detective, has to dig through the seedy underbelly of the city, dealing with various criminal elements like the shadier parts of the mafia - like groups in the animal world. They might face obstacles from corrupt officials who are in cahoots with the criminals.
The main villain could be a powerful and wealthy business - animal who is involved in illegal activities on the side. They use their legitimate business as a front to cover up their crimes, such as smuggling rare and endangered species for profit. They have a network of hench - animals who do their bidding and are very difficult to catch because of their influence in Zootopia's high society.
One example could be a story where a powerful and corrupt group of animals takes over the government in Zootopia and starts to oppress certain species. The main characters then have to fight against this unjust regime. Another could be a fanfiction where a mysterious disease turns some of the animals savage again, like in the movie, but this time the cause is much more sinister and the spread is harder to control, leading to a lot of chaos and fear in the city.
There's a fanfic called 'Zootopia Meets Sonic's World'. In this one, some of the Zootopia characters find a portal to Sonic's world. Judy and Nick are the main Zootopia representatives. They are amazed by the different zones in Sonic's world and team up with Sonic to stop an evil force that wants to destroy both their worlds. It's full of interesting interactions between the two universes.
I'm not sure specifically as there could be many different plots in a fanfiction with that title. It might involve various characters from Zootopia sharing 100 kisses in different scenarios, perhaps as a way to show love and friendship among the diverse animals in the city.