Given Marco's strong sense of belonging to this time-space, coupled with the fact that he no longer had many ties left in his own time-space.
Houka decided to grant Marco a "legal" identity, allowing him to remain in this time-space forever.
After all, Marco got along very well with Gram and Newgate, and his strength was not lacking either.
Before this, Dracule Mihawk and Demon Heir Bullet had also officially obtained legal identities in this time-space.
They did not want to remain in that "weak" time-space that Houka had beaten into a generational gap, and chose to stay in this world with more powerful people.
After all, Imu, the Five Elders, the Four Emperors, and other powerful figures had all been eliminated.
Perhaps when Houka explored other worlds in the future, they could follow him along for some fun.
Ace brought Rouge to play in Future City, and he took the initiative to find his younger brother Luffy to hang out with.
He planned to reveal his relationship with Luffy, as well as Luffy's relationship with Dragon.
He hoped to sever Rouge's ill-fated bond with the young Dragon.
Ace knew that Marco's thoughts were probably no longer on the affairs of the Whitebeard Pirates.
Once this trip and "family visit" ended, Marco would return to his original time-space with the Straw Hat Pirates.
Ace could no longer handle what came afterward.
Luffy had not expected that this interdimensional sightseeing trip would make both Nico Robin and Nami consider staying in this time-space.
Danger!
The future Pirate King Luffy might lose his navigator and archaeologist.
However, both the Red Line and the Calm Belt had disappeared, and the Grand Line's extreme weather had lessened, slightly reducing the importance of navigators.
With the World Government and Celestial Dragons destroyed, historians had likewise