One piece : All straw hat pirates with their titles.

Hey there here is titles of all straw hat members.

1/10 Mugiwara no luffy 

Monkey D luffy 

The secret behind this is that  Protagonist (You know what I am talking about), Monkey D. Luffy,So Luffy wears Straw hat and he had a crew and that's the reason why they are called Straw Hats(Mugiwara, True Fans “You know this better than Anyone”).

2/10 Pirate hunter zoro

Roronoa zoro

Before Zoro decided to join the Straw hat crew, he was a professional pirate hunter. He used to capture/kill pirates to get the bounties on their heads.Zoro was one of them. So that's how he got the nickname.

3/10 Cat burglar nami 

Nami 

When nami was come in straw hat she stole pirates money on thier ship and that its become nami's bad when she also called berri lover nami.

4/10 Black leg sanji 

Vinsomke sanji 

Black" comes from his Black Suit. "Leg" comes from his fighting style. I think, marine has little information about Sanji at that time, so they just use Sanji Suit color + Fighting Style = Sanji the "Black Leg". Black Leg refers to his black suit, black as in something to be feared, and his mentor Red Leg Zeff.

5/10 God usopp

Usopp

For he is 'God Usopp'. For the many reasons why Usopp is now worth more than Zoro and Sanji. God Usopp is essentially the creator of the Grand Fleet made up of 1000s of strong warriors dedicated towards the Straw Hats did have a 5-star bounty by Doflamigo which is more than Luffy's star bounty.

6/10 Cotten candy lover chopper

Tony tony chopper

While others have some fearsome epithets, such as 'Black Leg', or 'Pirate Hunter', Chopper is renowned as the 'Cotton Candy Lover'. As evident, this is because of his love for cotton candy, and partially because Chopper isn't seen as a threat by the world anyway.

7/10 Devil child 

Nico robin

Nico robin is called the devil child because her village learned an ancient language which was lost to time and deemed illegal to know how to read the language. Well as a small child at the age of 7, robin learned how to read the language.

8/10 cyborg franky 

Franky

Originally from the South Blue, Franky was abandoned by his family as a four-year-old, eventually making his way to Water 7. There, he came to be a member of Tom's Workers, until an incident resulted in his body being heavily damaged and requiring him to augment himself into a cyborg.

9/10 Soul king 

Brook 

After the timeskip, Brook has named his sword "Soul Solid", due to him developing the ability to coat it with the aura of his soul, freezing it in the process, and anyone who comes into contact with it. He also claimed that the Longarm Tribe has helped him sharpen the sword.

10/10 Night of the sea 

Jimbei 

For the chapter and episode of the same name with his epithet, see Chapter 528 and Episode 430. The subject of this article is sometimes called "Jinbei" or "Jimbei". "Knight of the Sea" Jinbei is the helmsman of the Straw Hat Pirates. Jinbei is a whale shark fish-man and a powerful master of Fish-Man Karate.