As the captain of the crew, Luffy has been recognized by the World
Government as the most dangerous member of the Straw Hats. Due to Luffy
being a relatively new pirate, the World Government originally did not
pay much attention to him. However, with each new outrageous exploit
Luffy and his crew have accomplished, their views on him have changed.
First bounty: 30,000,000 for defeating the three top pirates of East Blue.
Recognized as a powerful fighter within the Straw Hats through his
battles with various opponents, Zoro is given a bounty by the World
Government with just as much recognition as Luffy in terms of being a
Second bounty: 120,000,000 for his involvement with his fellow Straw Hats in the Enies Lobby Incident and for defeating Kaku of the CP9.
Cat Burglar Nami
For her involvement with her fellow crew members in Enies Lobby and for defeating Kalifa of the CP9, Nami is recognized as a threat by the World Government and is given a bounty of 16,000,000.
While most of the other Straw Hats are impressed at having bounties,
Nami does not particularly like being a wanted person. Her picture was
taken under the false pretense of a reporter wanting to take her picture
for a magazine, hence the suggestive pose.
Sniper King Sogeking
For his involvement with his fellow crew members in Enies Lobby,
specifically burning the World Government flag and sniping off marines
on the Bridge of Hesitation, Usopp is recognized as a threat by the World Government and is given a bounty of 30,000,000.
Due to Usopp disguising himself as Sogeking at the time, the
authorities have attributed Usopp's bounty to his Sogeking persona.
While most people easily recognize Usopp as Sogeking, Luffy, Chopper,
and the people of Usopp's village (with the exception of Kaya and the former Usopp Pirates) do not realize that they are both the same person.
Black Leg Sanji
For his involvement with his fellow crew members in Enies Lobby, for defeating Jabra
of the CP9, and for closing the Gates of Justice, Sanji is recognized
as a threat by the World Government and is given a bounty of 77,000,000. However, because Attach
of the Marines forgot to remove the lens cap when taking the picture, a
proper picture of Sanji has not been taken. Instead, a crude drawing of
a person that barely looks like him
is substituted. This, along with other incidents involving the picture,
are part of a running gag on how Sanji has bad luck being recognized
because of his bounty image.
Cotton Candy Lover Chopper
Despite his involvement with his fellow crew members in Enies Lobby and defeating Kumadori
of the CP9, Chopper is mistaken for a pet due to his normal size and
appearance. Therefore, he is not considered much of a threat to the
World Government, and was given a measly 50 bounty.
Devil Child Nico Robin
While a cover story is given to the general public to explain Robin's
initial bounty, the actual reason is because the World Government sees
her ability to read Poneglyphs as a threat to world safety. After
joining up with the Straw Hats, however, the government's view of her
becomes more genuine.
First bounty: 79,000,000 for sinking six Buster Call battleships (in truth, for her ability to read Poneglyphs).
Second bounty: 80,000,000
for her involvement with her fellow Straw Hats in the Enies Lobby
incident (her wanted poster also gains a new picture).
While his gang's
involvement in the invasion of Enies Lobby is overlooked, Franky's own
involvement with the Straw Hats is recognized. Along with burning the
blueprints for Pluton and defeating Fukuro of the CP9, Franky is recognized as a threat by the World Government and is given a bounty of 44,000,000.
In his previous life, Brook had gained a bounty of 33,000,000
for piracy. This bounty and the picture accompanying it were issued
fifty years ago. After the timeskip, Brook's managers sell him out to
the Marines, allowing them to connect Brook's skeletal appearance to the
picture in the wanted poster. They also learned of his connection to
the Straw Hats.