Belladonna (ベラドンナ, Beradonna?) is one of the Kuja of Amazon Lily, presumably the doctor of the island. She is the one who set Luffy on fire to get rid of the roots of the mushrooms he ate. She also reveals to Luffy that Marguerite was the one to save him when the others amazons were preparing to shoot him. She is later seen by Boa Hancock's side after she suffers from a mysterious disease. 

(Source: One Piece Wikia)

Gold Roger was known as the Pirate King, the strongest and most infamous being to have sailed the Grand Line. The capture and death of Roger by the World Government brought a change throughout the world. His last words before his death revealed the location of the greatest treasure in the world, One Piece. It was this revelation that brought about the Grand Age of Pirates, men who dreamed of finding One Piece (which promises an unlimited amount of riches and fame), and quite possibly the most coveted of titles for the person who found it, the title of the Pirate King. 
Enter Monkey D. Luffy, a 17-year-old boy that defies your standard definition of a pirate. Rather than the popular persona of a wicked, hardened, toothless pirate who ransacks villages for fun, Luffy’s reason for being a pirate is one of pure wonder; the thought of an exciting adventure and meeting new and intriguing people, along with finding One Piece, are his reasons of becoming a pirate. Following in the footsteps of his childhood hero, Luffy and his crew travel across the Grand Line, experiencing crazy adventures, unveiling dark mysteries and battling strong enemies, all in order to reach One Piece. 
*This includes following special episodes: 
- Chopperman to the Rescue! Protect the TV Station by the Shore! (Episode 336) 
- The Strongest Tag-Team! Luffy and Toriko's Hard Struggle! (Episode 492) 
- Team Formation! Save Chopper (Episode 542) 
- History's Strongest Collaboration vs. Glutton of the Sea (Episode 590) 
- 20th Anniversary! Special Romance Dawn (Episode 907)

__Hobbies:__ Dancing, sword fighting, windsurfing

Karen Ramalho is a Brazilian voice actress.

As a child, Monkey D. Luffy was inspired to become a pirate by listening to the tales of the buccaneer "Red-Haired" Shanks. But his life changed when Luffy accidentally ate the Gum-Gum Devil Fruit and gained the power to stretch like rubber...at the cost of never being able to swim again! Years later, still vowing to become the king of the pirates, Luffy sets out on his adventure...one guy alone in a rowboat, in search of the legendary "One Piece," said to be the greatest treasure in the world...
 
(Source: Viz Media)

This new TV special tells the two years of Luffy's training with Silvers Rayleigh in Rusukaina Island after the Battle of Marineford, which has never been told in the manga or TV anime. It also features a new villain named Burndy World who is known as "The Destroyer of the World" and has the power of the MoaMoa Fruit (its ability is still unknown). Luffy has to protect Boa Hancock from the new enemy who escaped from the level 6 of Impel Down. He is newly designed by the original creator of the manga, Eiichiro Oda. 
 
(Source: Crunchyroll)

The manga is a comedy series featuring the characters of the Straw Hat Crew in an academic setting.
 
(Source: Anime News Network)