2) G1 Bluestreak knocks up Sam's Girlfriend while retaining his mecha format in the 2007 movie dimension.

So... he's still a robot... but he gets Mikaela pregnant? That would take some interesting biological fudging - probably one would have to make up some sort of thing about the Allspark spreading itself around as a way to save itself when Sam destroys it, so it's in more than just Sam. Mind you, that is not an original idea - I saw that in a fic at some point, probably more than one fic at that.