You can spawn player specific NPCs. You can use this to create mirrored NPC skins, make the npc look at the player, or simply hide unimportant ones from other players.

You can even nick players with protocols to make client specific changes. Imagine giving different names to teammates in a minigame or a friend prefix.

Easy to create with no flickering and a scoreboard per player Due to its smart client-side implementation this sidebar will only be rendered on the client as the server only handles delivering its content.