There is no "I" in "You"

[Aoi Magi]

You honestly expect me list out an infinite number of factors like that? C'mon, just a basic combination of your parents, friends, relatives, and their interactions with you in any given moment makes that moment unique to you. Our lives are made up of countless such unique moments which makes us unique individuals.

No, I'm not...that's beside the point. Rather out of the roughly six billion permutations of what you just described above what multiplicity of unique factors came together to determine your particular self at this particular time in history? Could such not be contingent...if so, by what mundane factors?  If not.... how?

No they are not contingent on anything specific, or rather all of the factors can effect my existence. There is no specific subset of factors if that's what you are asking. I might not be understanding your confusion, but within this universe, every quark, every particle is unique, and we are formed by a collection of such unique particles so I don't see how you might even think of something non-unique.