Kuina passed away in the manga because of a fatal stumble. This incident left a lasting impression and influenced the plot and characters' developments.
Chopper is very much alive in the One Piece manga. The creators haven't written his death into the story. He's an integral part of the crew and their journey continues without that tragic event.
Not at all. Law remains a significant character and has many ongoing plotlines associated with him. His presence continues to shape the events in the One Piece manga.
As of now, Sanji is very much alive in the One Piece manga. The story keeps unfolding with him as a vital part of the plot. The author hasn't written his death yet.
Zoro is still alive and kicking in the One Piece manga. His character has overcome many challenges but hasn't met his demise. The manga keeps him going strong on his adventures.