You mean an RSS feed? We have those already.
Horrible ethical issues be damned?
-you can create an army of yous or a harem of your favorite person
Ha! Joke's on you. I'd make a harem of anime waifus and those are already personality-less, wish-fulling, mono-trait, doormats who are all secretly dirty whores and sluts inside (they just need you to show them).
Creepiness aside, an addendum to my previous post on immorality is that if you're going to make people immortal, for the love of god, make sure you either include eternal youth or the ability to pick and choose your appearance because like hell would anyone want to be immortal and constantly aging (imagine being stuck in one of those hospital beds tied down by life support forever).