One day, Luffy and his friends arrived at one island and so Luffy, Usopp, Zoro, Brook went to eat at the restaurant, Nami and Robin went shopping, Chopper went to find new medicine, Sanji went to find food for cooking, Franky was standing sentry over their pirate ship. On the island, there was a man who is called " Blackbeard." He wanted an ability that Luffy had. He had a strange Devil Fruit, Toru-Toru Fruit, which can degut the power. He also had a friend. His name was Mr.2 Bon Kurei and he had an ability that he can become a different person whoever he had touched once.
Chopper was walking on the street, then someone pitched him into the cage. He opened his eyes, Mr.2 was standing in front of him.
Chopper: "What are you doing!?"
Mr.2 "Hahaha, I am sorry, but I can become you!" he said and he was gone somewhere.
Chopper tried to get out of there, but he could not.
Then Mr.2 moved on to the restaurant where Luffy was. Luffy had just left there and he met Chopper, however he was Mr.2. Luffy and his friends could not realize that.
Mr.2: "Hi everyone! Oh, are you ok, Luffy? You look sick! Ok, I have to check your body because I am a doctor." Then he withdrew blood and went to somewhere. Mr.2 ran to Blackbeard and gave the blood to him.
Blackbeard: " Hahaha, I can get his ability." He put the blood in a strange Devil Fruit and he ate it. ….. His body turned to rubber!
At the time, Luffy finally realized that because he could not use his power.
Luffy: "What! Why!?"
Usopp: " Luffy, Chopper was different from usual, right? "
Luffy: " Yeah, I think so… "
They walked on the street and found Chopper who was trapped in the cage.
Chopper: " Help. Someone did that and he can become me. I do no know why he did like that."
Brook: " Yeah, we met him. He usurped Luffys power in some way.