Their interactions with others change over time based off of their own experiences. Students will also be interacting with each other at all times, even if the player doesn't go to school. Students' traits and stats may influence their appearance.
The things that NPCs do will be based off of their stats and personalities. They have the same active statistics as the player ( Diet, Depression, Stress, Kindness, Confidence, Lovey-Dovey, Fitness, Dexterity, Trouble, and Kiss.), and all of the NPCs can do the same things that the player can.
The students that attend the school are randomly generated in name and appearance at the beginning of a new playthrough, and they all have unique statistics and traits that make up their personality.