Tony Tony Chopper is a baby reindeer born on a winter island called the Drum Island, famous for its brilliant doctors, but since Chopper was the only deer with a blue nose, he was abused, and he felt apart from the others his kind.
Once, he ate a mysterious fruit on the ground that was actually a devil’s fruit which granted him the power to walk on two legs and to speak.
The other deers chased him off, so Chopper who felt really lonely went to the humans as a human form which he can become because of the devil’s fruit, but for some reason, his nose still stayed blue, so they thought he was a monster and started shooting him.
At the moment on the same island, the king took twenty of the best doctors to his castle and exiled the rest so soon after the only doctors left except the best twenty were a doctor called Kureha, who was quite active despite being one hundred and forty-one years old and a quack doctor called Hiriluk.
Doctor Hiriluk found the chopper in the jungle injured and took him home to treat him.
When chopper gets better, the doctor tells him a story about a now-dead how once there was a really sick person, and all the doctors in the world said that he couldn’t be treated and that he was going to die. Hence, the person went and then he saw the most wondrous sight he has ever seen, he saw cherry blossoms bloom, then when he went back he was shocked to learn that his disease was cured entirely.
From that moment on, Hiriluk devoted his life to making the winter island bloom in cherry blossoms the same way and save his island.
During the time that chopper was recovering, he and the doctor grew very close, almost like a father and son, and Hiriluk was also the one to give Chopper his name, but neither did chopper know that his beloved doctor was dying, so when he found out, he took it upon himself to find a cure.
Hiriluk, who admired the courage of pirates, had once told chopper that the symbol of the skull and crossbones means hope, so with that in mind, Chopper searched all the books on finds out about a mushroom with the same symbol drawn on it, so Chopper risks his life to get the mushroom and presents it to his beloved doctor.
Hiriluk, who knew that the mushroom was going to kill him, still took it and ate it since he didn’t want to upset the chopper and was already going to die.
But before dying, he asked doctor Kureha to take care of Chopper and teach him medical skills.
Later, when a powerful pirate group attacked their island, the king fled with all the royal guards and the doctors, so the only doctor left on the island was Kureha.
When the pirates left, the villagers were left to renew themselves with only one of the guards, who was the only good one amongst the royal guard.
After the incident, the only thing they feared was the return of their cruel thing, and when he arrived, luckily there was the straw hats crew on the island, so they took care of everything, and Chopper which still admired pirates, joined them as their doctor.