What if Luffy ate the gum gum fruit and immediately collapsed into a quivering mass of sentient rubber all unable to do anything but glop around and feel nothing but terrible pain from his mishmashed bones and organs constantly
What if Zoro decided to try three sword style in the real world and the first dude he met stabbed him in the guts cause it turns out a sword in the mouth isn't good for balance or maneuvering and he died in the gutter alone robbed and bleeding out reflecting on how he will never live up to his promise to his dead not girlfriend
What if one night while boy Sanji was alone in his room living with all these lonely male cooks that old dish washer guy who was always looking at him weird slipped into his room and
What if Arlong just got bored of being a big fish in a little pond and one day Nami returned home after a hard trip doing whatever it took to get money only to find the whole place razed to the ground and the only survivor was old man Genzo nailed to a tree who bitterly blamed her for failing to save them all before dieing in front of her
What if Captain Kuro killed that rich girl in front of Usopp and then pinned it on him and no one ever believed it wasn't him since he's such a liar so Usopp is forced to flee or die forever stuck living on the fringes of society a wanted murderer eating refuse just to get by and still dreaming of being a great warrior of the sea one day but knowing it will never happen because if he couldn't even save the girl he liked then how could he hope to save himself
What if Chopper got the painful ability to self reflect by eating the human human fruit but none of its transformative abilities forever a brilliant mind of a doctor stuck in a reindeer body unable to relate to either his own kin or the humans who drive him away and can't understand him
What if Robin never found true friends who value her for who she is herself and not for her knowledge or power and is forced to wander from group to group until one day she's a little too slow on the uptake and the marines capture and execute her, known forever more as a reviled criminal rightfully put down and not for her earnest intelligence or deep sensitivity or the crimes the world government perpetuated against her
What if Cutty Flam couldn't turn himself into a cyborg after getting hit by that train cause come the fuck on how is that even possible but he still survives and lives on for years after as the traitor cripple who almost brought ruin to his beloved hometown, reviled by all for his mistakes and his disgusting mangled broken body
What if Brooke was unable to reconnect with even his skeletal corpse at all and was forced to wander forever as a disembodied spirit eventually finding Laboon but unable to interact or notify the whale to his presence in any way and stuck watching maddened as the whale slowly beats itself to death over the years, never aware that one of its beloved friends was always inches away watching anguished