players would have a status that would show different things and this could be changed via a status vpn on a npc

online: its a green circle that only appears if someone is online and thats it

offline/invisible: this signifies that you are offline. it is a hollow grey circle

do not disturb: a red circle with a line going through it, mentioning this person in chat wont notify them and notifications go away faster (except for player made notifications)