I created my setting this year to help me practice on characterization and creating different fun characters as much as possilble during Nano. During my writing, I faced a lot of difficulty making the different chatacters stand out like giving them a unique voice or mannerisms that fits well with their other traits.
I decided to center the story around a character I created for this purpose, a Messenger who has lived for as long as anyone can remember. He doesn't age, and simply had always delivered parcels, the catch being that the parcels can be delivered at any time, at any place from that moment onward, no matter how long it takes, or to where or to whom (condition apply) for a special price, that being the sender's eternal companionship to the messenger.
The idea being that the messenger will be traveling with different companions who he can summon from different times, each keeping company until their parcels are delivered. Should be fun.