In the interest of honesty, I don't really want to see The Stranger save the day, but I do want to know what he's up to. That's always been the mystery it seems. The Stranger shows up, grabs people of unusual capabilities, and either gets away from them, or gets thwarted by the heroes and leaves, making cryptic pronouncements all along.
He tried to abduct a Skrull Empress because she could restore the ability to shift form to all the Skrulls that had lost it, but ultimately traded her for Captain Reptyl's entire crew, which included a mutant with a remarkable ability for navigation. It did save him the trouble of slugging it out with Reptyl and the Silver Surfer, so probably a wise decision. (Silver Surfer #27)
And there was the time Quasar found the Stranger's world, and it was kind of a composite, with all sorts of different habitats, occupied by all kinds of different people, including Ego-Prime(?!), who tried to eat Quasar (that would have had to have been his most embarassing death, had it continued). (Quasar #14ish)
It suggests a geneticist, or maybe an anthropologist of some sort. But what's he trying to accomplish? My best guess is a galactic-scale Mr. Sinister, running all sorts of experiments to see what happens, and then using the results for... something. I don't know what. We need someone to look into this. Mr. Giffen you got any free time coming up after Annihilation ends?