Since it's a furry visual novel set in a city, the main characters could be a diverse group of anthropomorphic animals. There might be a brave wolf who is trying to protect the furry community in the city from some sort of threat. Or perhaps a clever raccoon who is always getting into and out of trouble with his schemes in the city. There could also be a gentle deer who is new to the city and is trying to find their place among the other furries.
I don't know the specific main characters as I haven't read it. But they are probably furry characters like a fox, a cat or a dog.
There's no way to tell for sure who the main characters are without actually experiencing the 'our city furry visual novel'. But based on the title, we can make some assumptions. It could be a group of furry friends. Maybe a popular and outgoing fox who is well - known around the city. A shy and introverted rabbit who is slowly coming out of their shell. And a strong and reliable bear who is like the protector of the group. They could all have different personalities and goals that drive the story forward in the city setting.