I can't even imagine how many people will probably be riding for Luffy by the end of the series...
-The Straw Hats
-Probably Dragon, Ivankov, and the Revolutionaries
-Shanks and the Redhair Pirates
-The ex-Whitebeard Pirates (I'm sure they'll turn up at some point)
-Probably the Heart Pirates (Law and his crew)
-The Alabasta army
-The Drum Island Army
-The Skypieans (Wyper and all of them)
-Franky Family
-Galley La (Paulie and them)
-Thriller Bark Denizens (Lola and co.)
-Flying Fish Riders (homie whose face Sanji rearranged and his crew)
-Boa Hancock, her sisters, and basically everybody on Amazon Lily
-The prisoners he freed from Impel Down who said the owe him
-King Neptune, his sons, and the whole Fishman Island Army
-Shirahoshi (aka Poseidon)
-The Samurai (Kinemon) and probably some of his people since he definitely owes the Straw Hats
-Brownbeard and his crew (maybe)
-Don Chinjao and his grandsons (one of whom has a Navy and Don offered to Luffy)
-The Dwarves on Dressrosa
-Bartolomeo (since he's a Luffy stan) and his crew
...and I'm sure I forgot half of them.
World Government is gonna get their shyt pushed back.