Which of the following species of shark is most dangerous by character?

Well grey,silver-tip reef sharks are quite unlikely to attack you, nor are lemon sharks. Greenland sharks are quite rare and not many people swim in greenland, so they're attack rate must be low. Black-tip sharks have attacked quite a few people and so have dusky sharks. Galapagos sharks are quite aggressive as are sand tigers. Caribbean reef sharks and Silky sharks are not particularly dangerous either. If by bronze copper shark you mean bronze whaler (also known as the copper shark) then it would probably be that species. They grow large and can be very aggressive.