One Piece Does Robin Betray Luffy. Luffy made his debut in One Piece Chapter 1 as a young boy who acquires the properties of rubber after accidentally eating the supernatural Gum-Gum Fruit. Is Luffy a girl.
Nico Robin questions why Spandam was given rights to the Buster Call which triggers his anger thus leading to him beating her. Luffy considers Law as a friend and trusts him fully but Laws loyalty remains mysterious. First one to betray was Nami.
Entering the story as the partner of Big Bad Mister 0Sir Crocodile under the alias Miss All Sunday Robin asked to join the crew because Luffy had forced her to live rather than die.
Ussop officially left so it does not count as betrayal but still Luffy felt betrayed. To me this is a question of perspective. We all know Luffy makes his mind up about Nakamas and then just carries that through. Robin hasnt really had an easy life as a child she was left by her parents met one person friendly to her who was killed then watched as her entire island was annihilated.