Virtual SMP Roster
40 virtual players with Builder, Redstoner, PvPer, Wholesome and Chaotic personalities take turns online. Only the players who are online speak.
Good To Know: The online group is kept between sessions.

Death Reactions
When you die to a creeper, lava, a fall, the void, a mob or anything else, two to four virtual players react in turn and offer to help.
How It Works: Fall from a high place and one player jokes about the missing water bucket while another offers to meet you at spawn.

Ore Celebrations
Mining Diamond Ore, Deepslate Diamond Ore or Ancient Debris makes virtual players congratulate you.
Good To Know: A whole vein starts one conversation, not one per block. The same ore type will not start another for 1 minute.

Welcome Back, Sleep and Travel Chat
Virtual players greet you when you join, comment when you go to bed, and react when you enter the Nether or the End.
Good To Know: Sleep and travel comments are limited to one every 3 minutes for each kind.

Ambient Banter
Every 1.5 to 3 minutes the virtual players start a 2 to 5 message conversation about weather, farms, trading, raids, bosses, pets, music and more, from short scripted chats to small PvP dramas between three of them.
Good To Know: Conversations are spaced out so replies appear one after another. Overlapping events wait in a short queue instead of flooding the chat.

Spawner Tips
Rarely, a virtual player points you to a Monster Spawner near you and gives its real coordinates, usually a dungeon. About one in three tips drops a minus sign, and the same player corrects it between 100 and 150 seconds later.
Good To Know: Only spawners in loaded areas of the Overworld, within 16 blocks of you sideways, are found. Tips come at least 15 minutes apart, a spawner is announced once, and nothing is said when none is nearby. It can also be a mineshaft spawner.