NPC Interaction
NPCs:
Each NPC has a different personality which means that each of them can speak differently. They're able to read their stats such as grade, age, height and ethnicity which all alter how they will/can answer. NPCs are also able to read your own stats and mention them in a conversation.
Commands:
You can use commands such as /s to shout or whisper and they'll whisper/shout back at you (not always). Some NPCs do not like shouting or will find it weird to shout.
Memory:
NPCs can remember you. If you tell an NPC their name, they'll remember it and when you go away and come back to ask them "do you know me" they'll mention your name and say how you were here a second ago.
Time:
NPC interactions also depend on time. When it's morning and a class is starting, they'll tell you how it's time to go to class
they're able to mention the time and which class you need be in, if you ask them which class to go some will say the exact time of how long it'll last
Locations:
NPCs know their location, depending on where they stand, they'll mention it if you ask them and also what class you must be