Why Does Nico Robin Leave The Crew. Robin recognized Trafalgar Law as a pirate when Luffy asked who he is. Robin doesnt have the raw physical strength to pound foes into submission.
So far Nami Robin and Usopp have all chosen to leave the crew in the past before returning. When Luffy met Zoro the swordsman was tied to a pole-where he was serving a 30-day sentence for killing a wolf that belonged to the son of a corrupt Marine Captain. Every pirate crew needs a first mate and for the Straw Hats thats Zoro -a green-haired man who dreams of becoming the worlds greatest swordsman.
Robin left the crew without saying a single word to the crew and Luffy did not want to end their nakama-ship just like that.
This would result in the Straw Hats traveling to Enies Lobby the following arc to save her. Her mother Nico Olvia went out to sea to find the True History when Robin was two years old leaving her in the care of Olvias brother and his wife Roji. Why is Robin so weak. While passing through a construction site from 300 years ago Robin inquired about the bridge.