Ya but even though they are the opposite of each other doesn't mean if for (example finn dated fp) means that fionna would date him. Plus in finns world pb will never ask him out but the opposite happened with fionna. And also it could be the same thing with marshall and pg ^_^ but the rest is true basically plus I think that the worlds on have the characters in common nothing else which means the events are totally different thats what I think wbu
#3 all the way. Sweet, smart, rich, loyal, royal, cooks, and has just about every other trait a girl would possibly name off the top of her head and wouldn't you know it? Prince Gumball makes the girls go!...meh. Couldn't you just see him on a window moaning to the night "Nice guys finish last..."
Hmm I suppose if we look at it from a biological perspective, Gumball's kind and helpfull qualities make him USEFUL, but Marshall's aggressive and dominant qualities make him sexually attractive. Despite what the human part of the brain says, the lizard brain in them thinks Marshall's asshole tendencies are the best bet for offspring. Nature cares not for kindness after all. So an ideal situation would be masculine Marshell for mating and non-threateningly feminine Gumball as basically a eunuch servant (girly enough to trust but as a male will not threaten her and marshall's alpha status).
#2 Made me laugh. Indeed how Marceline and PB won't give Finn the time of day, yet its almost dating sim in the alternate universe. Good thing this is in OOO, the romantic overtures of Marshell and Gumball for Fionna would cast a VERY different tone in 21st century U.S.