10 Can Defeat: Coby
Coby is undoubtedly Luffy's oldest rival and one of the first characters to debut. ... He's strong, but not strong enough to be Luffy's match.
Is Coby Luffy's enemy?
He later appeared again saying that when they meet again both him and Luffy will be enemies, despite this he still keeps his morals intact and still considers Luffy a friend. He is promoted to captain and joins the Marine's special forces called "SWORD".
Can Coby use conqueror Haki?
Ever since then, Coby has evolved drastically as a character, and today, he holds the position of Rear Admiral in the Navy. ... It's no wonder that the Marines don't usually have conqueror's haki, and just like everyone else, it is highly unlikely for Coby to awaken conqueror's haki.
