Fushi, still borrowing Bon’s body until he gets all his vessels back, per Bon’s wishes, enjoys one final meal with his friends and comrades old and new. After everyone discusses their dreams going forward, he declares that Eko has died, and she soon joins Ghost Bon in ghost form. Fushi isn’t ready to bring her or others back until the world is free of Nokkers.
March is understandably upset to be losing her child once again, but Fushi cannot continue spreading his roots to every corner of the world and defeat all the Nokkers without ceasing to be an individual person during that time. March still won’t leave his side, and is ultimately euthanized, which seems damned extreme if you ask me!
That said, March was on borrowed time and was resurrected by accident in the first place. It’s also not goodbye if she passes here and now, because one day Fushi will be back and so will anyone or everyone he loved, if he so wishes.
Another who cannot live without the being he was literally bred to love is Kahaku, who manages to off himself by jumping into the Bennett equivalent of Mount Doom and kill the Nokker living within him, releasing the vessels it stole back to Fushi.
Some time passes, and Fushi’s roots continue to spread throughout the world, becoming an omnipresent part of everyday life. Then one day, without warning, Prince Bonchien Nikolai La Tasty Peach Uralis returns to his family, who immediately glom onto him and shower him with love. Then, one by one, the Beholder describes how all of Fushi’s immortal allies die, each of them for better or worse living the lives they wanted to live.
Time passes…a lot of time. The days of Prince Bon, Uralis, and Renril represented a high renaissance-like era. But when he finally awakens as the Boy (at his original age), he finds himself in a modern metroplolis of skyscrapers, cars, cafés…and his roots.
In this age, the Nokkers are (presumably) all gone, and Fushi is everywhere. His eyes turn from yellow to purple, likely for good. As for what he’ll do in this age, who (if anyone) he’ll bring back, and who he’ll meet, we’ll have to wait for a confirmed Season 3. Until then, mata ne, Pink Blood.