basically the entity that went into Jesse, in the comics at least, is the offspring of a demon and an angel, so it's both good and evil or neither really. It has tremendous power, infinite really, but for some reason it needs a host body. That's why in the show it went into all those spiritual leaders, none of that happens in the comic though. So in the show it first goes into the wholly good African preacher, but since it's technically half demon that host was probably too good, so it went to satanist leader in Russia, but since it's part angel he was too evil. So it went to Tom Cruise, but he's too crazy. But in Jesse he's good but also kind of bad too, or again not really either good or evil but something else. He, like Genesis(the Angel/Demon baby), are torn between two competing natures or have a totally different nature from the rest of the world. They don't explore this in the comic so it will be interesting to see if they do more with it in the show or if all that will be relegated to just the premier and they wont both to explore why it chose Jesse.
