Tony Tony Chopper/Personality and Relationships

Personality
Chopper is naive and incredibly timid, often acting like a child because he doesn't know any better. Like Luffy, he is easily impressed at things like beams, cannons, and hidden abilities. He is a coward at times like Usopp and Nami, although his cowardice can be attributed to his childishness and overall lack of trust in his own fighting skills (a contrast to Nami's self-survival based cowardice and Usopp's fear based cowardice). Chopper is more or less on a journey to define himself, seeing almost anyone on his team as a role model and in some cases, imitate their behavior, especially Usopp. He is an upright friend and companion who will try anything to overcome a task given by his team. He still has a feeling of distrust for humans from his youth and will often outright insult and claim that compliments don't make him happy to a human who compliments him while obviously being happy about it (he starts to smile and also dances a little which has become a running gag). Chopper seems to be very forgiving of those close to him, for when Usopp wanted to rejoin the crew at the end of the Enies Lobby Arc, he called out to Luffy and Zoro, although they were ignoring him completely. He would rather run and hide than fight, but becomes more courageous when others are there to support him. His dream is to carry out his deceased mentor, Hiluluk's belief that there is no incurable disease, and to become a doctor that can cure any illness.

Another one of Chopper's habits is his reverse cartoon peek, where he stands behind a wall or a doorway and peeks at people, trying not to be seen by them. Unfortunately he's not hiding his body behind the wall, as a result his body is visible and only one half of his face is hidden.

A running gag is that Chopper will believe just about anything he hears, making him easy prey for Usopp's stories. He also believed Nami when she lied to Lola about being a man, even though the truth was very obvious. When there is someone who is injured he always panics and screams "Call a doctor!!". It isn't until he figures out that he is the doctor or when one of his crewmates hits him that he starts to tend to the injured person (he seems to have stopped doing this after the two year time skip). Another one is when he (and Brook) jumps into the water without hesitating to save Luffy from drowning, only to drown with him (since the Devil Fruit that he ate makes it impossible for him to swim). He, together with Brook and Luffy, ends up being saved by the other members of the crew.

Crew
Within the group, Chopper often fools around with Usopp and Luffy for laughs and is also a thankful listener to Usopp's lies, most of which he really believes, at least for a short time. Frequently, Chopper is one of the first to join in with Luffy's antics, as well as watching in glee for some of Usopp's stunts.

He shares a taste for reading with Robin who calls him "Doctor-San" which makes him dance in joy, they also seem to have a genuine sense of respect for each other possibly due to their pursuits in knowledge; ironically, he was originally rather intimidated of Robin upon finding out that she specializes in assassinations, fearing that she will one day assassinate him once his guard has been let down, but at the same time, was amused when she first displayed her Devil Fruit powers to entertain both him and Luffy, and eventually opened up to her. His fondness towards Robin is what compelled Chopper to use his Monster Point Form against Kumadori during his battle in the Judiciary Tower. Sanji originally wanted to cook Chopper (along with Luffy who wanted to eat him raw) and jokingly wants him to join as "emergency food supply" later in the Drum Island Arc. Throughout the series, Sanji continues to refer to him as "the emergency food supply" to tease him but considers him a friend, Chopper was one of the first people to realise how life threating his nose bleeds were even begging the fishmen for blood donations. When Chopper first met Brook, he was terrified of him because he was a walking, talking skeleton. But after hearing the story about Brook and Laboon, Chopper cried and stated he wasn't afraid of skeletons anymore and they now get along real well.

Chopper also seems to have a close relationship with Zoro, whom Chopper near idol worships because he's "so cool". One of his favorite things to do is to ride on Zoro's shoulders when they are traveling and often runs to him when he's scared. Zoro also seems more protective of Chopper than anyone else. It is seen that Zoro is the one to save him when he comically falls into any form of water when trying to escape Nami's wild mood swings (while Sanji has saved Luffy frequently in comparison), though Chopper still gets annoyed with Zoro whenever he takes off bandages from injuries he sustained from battles.

Notably, Chopper originally wasn't hired to be the ship's doctor by Luffy, but just for being a "talking transforming reindeer monster." The other boys of the crew have often mentored Chopper on what it means to be a real man; He is the youngest crewman, not originally human, and has had a relatively sheltered life. Within his combat relationships, he has at least three canon team attacks, as a homage to his personality (which can be easily influenced), each of the attacks are named with half of the other crew member's name and half of his name. All of the examples feature the fellow crew member's name first in the name then his own such as "Hissatsu Uso-Cho Hammer Suisei" where Usopp's name is the first mentioned.

Friends
Back on Drum Island, the people have come to accept his help in defeating Wapol, even though originally they were afraid of him. Chopper has also gained Dalton's respect.

After being "sent" to the Torino Kingdom, Chopper was very distressed as he was treated as a plaything by the birds and hounded by the natives as food. However, after Chopper managed to resolve the conflict between the natives and the birds, he was treated almost like a hero. After receiving Luffy's message he returned and the natives were glad to share their knowledge of herbs, medicines, and plants with Chopper, especially after he helped solve their conflict. The giant birds of Torino Kingdom were also happy to fly Chopper to the Grand Line whenever he wanted to.

Enemies
One of Chopper's major enemies is Wapol, the spoiled king who insulted the death of Chopper's surrogate father, Dr. Hiluluk, among other things. Chopper initially idolized Dr. Hogback, but after learning of his disregard for human life and that he uses his medical expertise only for fame and wealth (as opposed to Chopper's philosophy of a doctor must cure any patient regardless of reward), as well as coming into conflict with him and the rest of Gekko Moriah's forces, he declared that he no longer considers him a doctor. He wanted by the Marines, albeit with an extremely low bounty of only fifty Beli and with only one of his transformations noted in the Bounty poster.

The Herd
Chopper's real family is a herd of reindeer, who abandoned him for being different. Initially estranged for being born with his blue nose, he is further abandoned after eating the Hito Hito no Mi, which gave him two "unreindeer-like" humanoid forms. He eventually found his path intertwined with them again during his days with Hiluluk when he was beaten up by them (where his left antler was broken). However, he was able to pass through them despite this and achieve his goal at the time.

Hiluluk
Hiluluk was Chopper's mentor who took him in and became his "father." They had a close relationship with each other, and had formed a deep bond despite their almost constant arguing with each other and Chopper had a hard time when he was informed of the disease Hiriluk is suffering from. Despite his time spent with the superior Doctor Kureha, Chopper refers to Hiluluk as "the greatest doctor in the world." Hiluluk also gave Chopper his name, claiming his antlers looked like they could chop down trees.

Kureha
Though neither family nor claiming to have adopted him, Dr. Kureha is his mentor. While she often hides her feelings towards him she considers him to be like her son. She is very happy to know he is currently doing well as an pirate.