One Piece ending.
By the end of One Piece when Luffy had finally reached One Piece and become the Pirate King, he would probably be overwhelmed by a huge force to capture him and ends up getting caught by the WG to let his comrades escape. And then, we would be getting a redux of Loguetown Arc in which Luffy is prepared to be killed, but no longer as 30,000,000 million berry Pirate Luffy, but as the 2nd Pirate King, who will always be just 2nd the the greatest, Gol D. Roger. Of course, before he gets killed, his nakama would try to free him via how they did last time, but alas, all gets caught as well. However, the perrenial difference that ties Luffy and Roger is that...all of a sudden, a Navy officer begs for Luffy's release and pardon, Coby. And slowly as the moment passes, one man who wished for the release of Luffy, became more and more, as the Village Chief of the Buggy Arc and Arlong arc too comes and begs for Luffy's release. WG ignored them as measly pest until mere town leaders and Navy officer became a giant whale to 2 wanted Giants, Dory and Broggy to leaders of influencal nations, King Dalton of Drum, Queen Vivi of Alabasta, God of Skypeia and also organizations that heavily contributed to WG, like Galley-La, and of course, the many many more people that Luffy would directly or indirectly save throughout One Piece all of which demands that Luffy be released, or else they would oppose and rebel against the WG. In the end, they couldn't risk starting a World War just for the death of one man and releases Luffy.
And there was born a legend, the legend of the man who surpassed Gol D.Roger, not because of strength, not because of achievements, but because of those around him.
Monkey. D. Luffy.