Personalities are characteristics that are shown by the villagers. They are divided into different categories and there are often at least 2 villagers with the same characteristic.
There are 6 known different personalities throughout the Animal Crossing Series, those being:
These personalities reflect on the villager of how they will treat you and other villagers. They all have their likes and dislikes, and can only relate to other villagers with a certain personality. It can either be difficult or easy to befriend with a villager but this will depend on their personality.