Why Nico Robin Join Cp9. As she herself said Baroque Works was just one of those organisations. Since she reached the age of eight and her homeland was destroyed she survived by joining shady organisations gaining experience in skills like assassination and then destroying them from the inside out.
While Robins father was never revealed Olvia stated that she will honor her husbands dream she then left to study the poneglyphs. She was a mystery throughout the Alabasta Saga and her joining the crew was a shocker to readers and characters alike. Rob Lucci is one of the greatest mangaanime villains of all time.
Robin betrayed the straw hats shortly after they got her to join CP9 so that they didnt kill the straw hats and because she wanted to die.
He hit a Celestial Dragon for example and their way above any branch in the World Govt. Robin should take it. They call her the Devils Child. From the East Blue to the New World anything related to the world of One Piece belongs here.