What would it/they be? This is just a strictly for fun challenge, so nobody who doesn't want to tackle it doesn't have to, but anybody who DOES want to tackle this is more than welcome.
I'll start first:
Well, as for the first movie, I would have probably had Aladdin wish Genie free when he had the chance (actually, RIGHT AFTER the "Cave of Wonders" escape both so that we could see Al trying to earn Jas's affections completely honestly rather than pretending he was a Prince AND so that he can fight Jafar on even ground when the time comes [since Jafar wouldn't have the power the Genie gave him in the official version, he would be forced to rely mostly on his wits and daring in the fight against Aladdin, thus putting the playing field more or less even]). Second, Jafar at the end of the first movie, WOULD be taken away by the royal guards to face execution (treason IS a capitol offense, after all) though Iago would make good HIS escape. Third, AL and Jas WOULD be married at the end of the first movie. As for the second and third movies, there wouldn't BE a second and third movie; Iago's semi-reform and Aladdin's father issues would actually start to be covered IN THE SERIES. Speaking of the series, I would make Abis Mal a lot smarter AND much less klutzy. Heck, I'd make Abis Mal a "both brains AND brawn" type villain with a somewhat well-respected general public image [somewhat like an ancient Arabic version of Marvel Comics' the Kingpin]). I mean, as persistent as he is, he should at least have the brains and skills to show SOME legitimate threat rather than be stuck as a relatively minor annoyance villain.