The Rumbar Pirates made their memorable appearance during the Thriller Bark arc. They are especially recognized because Brook was once a member and later became a key figure in the crew, prior to joining the Straw Hat Pirates.
Do you remember Laboon, the giant whale? The music of the Rumbar Pirates helped forge a deep bond between Brook and Laboon. When the Rumbar Pirates were about to enter the Florian Triangle, they had to leave Laboon behind and promised to return to meet the giant whale after conquering the dangerous waters.
Unfortunately, the Rumbar Pirates faced a tragic fate, with all crew members sacrificing themselves, leaving only Brook alive due to consuming the Yomi Yomi no Mi fruit, which granted him a second chance at life. When he reunited with the Straw Hat Pirates, Brook had hoped to meet Laboon again someday, fulfilling the long-standing promise of the Rumbar Pirates.
Therefore, it is likely that the second part of the live-action One Piece series will delve deeper into the backstory of the Rumbar Pirates, potentially even expanding on the story arc related to Laboon.
