At the very end of the last Halo game (probably Halo 6), there should be a cutscenes where Master Chief gets picked up by a space taxi and goes back to his home planet of Eridanus II. On the way it shows a montage of him looking out the window at all the different locations that were in Halo, from the ruins of Installation 04 to Reach and everything in between. Finally, our beloved hero arrives at his house in some neighborhood, the number on the house reads 117. Master Chief steps out of the taxi, and walks up to the front door, opens it, and yells "Honey, I'm home!"
Roll Credits.
[b]edit:[/b] we're trending!
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He should turn out to be one of the Covenant prophets. Him being human was a lie for the humans the whole time.