TL;DR
Personal and/or locker chests especially for multiplayer gamesWhat ?
It should be possible to craft personal or locker chests. The size or type maybe does not matter (just choose one of the chests types, maybe the iron or steel chest).For a personal chest approach (crafted by player A and player B tries to loot it) player B should at least get a message/warning when viewing the chests contents that this chest and its content belongs to player A (yes I know that you can see it on the right side when hovering over the entity, but not every chest should be a personal one only a special crafted one and it would be best to see that message/warning when viewing the chests content).
For this just personal locker approach it should still be allowed to loot or dismantle it.
Maybe the special chest image for the personal chest should have an additional small people/human icon on it to make it recognizable as a personal chest.
For a locker chest approach (crafted by player A and player B tries to loot it) player B should not be able to even view the chests contents or loot it by hotkeys from outside or dismantle it. But it still should be possible to destroy it by shooting at it or using explosives or similar (so that it can be removed if the player will never join the game again or it is totally in the way when something important needs to be build there). But player A should always be able to access the own locker chest.
Maybe the special chest image for the locker chest should have an additional key icon on it or similar to make it recognizable as a locker chest.
Obviously for crafting the personal or locker chests one/some additional ingredient should be necessary in addition to the chest itself.
Why ?
In (massive) multiplayer games there is often a conflict if you need to place your full inventory into chests and another one is taking those chests without asking. Sometimes the games are also interrupted and continued later or a player disconnects by being afk and comes back later. Therefore the players personal or locker chests should still be there when the player joins again.This would already be very useful for v1.1 stable to improve the multiplayer experience (not waiting for the later extension pack), I think.