Height
174.00 cm
Weight
61.00 kg
Age
17
Heiji is a high school detective, and the son of Heizo Hattori, chief of the Osaka Police Department, and his wife Shizuka Hattori. Heiji wants to be a detective like his father since spending his childhood looking for lost cats in his neighborhood, and he is also very skilled in kendo and has become a favored tournament contender for his school. At one time during their childhood, Heiji had had the unfortunate idea of locking himself and his friend Kazuha together with a set of old handcuffs which had no key to unlock it; as a result they involuntarily had to spend time together even on some rather intimate occasions (i.e., bathroom visits) before the cuffs could be removed. As a reminder of this 'closeness' and for good luck, Kazuha fashioned two identical lucky charms, each incorporating a chain link from the cuffs, which she and Heiji have been wearing ever since. In the news, Heiji has been publicly declared the "Great Detective of the West", while Shinichi Kudo is the "Great Detective of the East". As a result, Heiji showed up unannounced at the Mouri Detective Agency looking for Kudo, seeking to challenge his rival to a showdown of wits. (In fact, they had such a contest before, three years previously, during a skiing trip in the Yamagata prefecture, although they never learned about each other's identities at that time.) Heiji was soundly defeated in the following case after Conan Edogawa temporarily turned back into Shinichi, but he gained a lot of respect for Shinichi in the process. During their second encounter, Conan knocked Heiji out to use him as the mouthpiece for the voice-changing bow-tie. But during his final presentation of the facts, Heiji awoke prematurely and discovered Conan's secret, and in the end managed to blackmail Conan into revealing all. Ever since that revelation, Heiji has been helping Conan in hiding his secret identity, though he constantly slips up by calling him "Kudo" in front of Ran and Kazuha. Heiji and Conan most often congenially team up to solve assorted cases. Heiji has also helped Conan investigate the Black Organization on several occasions, such as when the two investigated Jodie Starling,or when Heiji investigated Eisuke Hondou on his own and then told Conan his findings, but he never had a real direct confrontation with the primary antagonist. He has also helped cover for Conan during several of the brief instances where Conan regained his true adolescent age, and has even disguised himself as Shinichi on several occasions in order to protect his identity, even though he is not very good at it (mostly owing to his distinctive Kansai dialect). When not working on a case, he regularly attempts to invite Conan to take in the sights and culinary delights of Osaka, which he considers more wholesome than Tokyo's. Even while solving a case, Heiji tends to be lighthearted and good-humored, preferring to work through it with a grin on his face. He is a big fan of baseball, and is most of the time shown wearing an Osaka cap, to support the local Osaka baseball team. He usually wears his cap with its visor pointed backward, but if he feels challenged, he turns the visor forward. Heiji is known for his pride as an Osaka citizen and for his thick Osakan accent, which has been pointed out and sometimes made fun numerous times. However, Heiji holds his head high and is always one to brag about the greatness of Osaka, especially when Conan comes to visit. Despite him knowing the value and necessity of remaining calm in the face of a crime, Heiji tends to be impulsive at times, which tends to cloud his judgment a little. This was discussed directly in the "Detective Koushien" case, when Saguru Hakuba accused Heiji of being a poor detective for disrupting a crime scene in his rush to see if the victim could still be saved. Heiji, however, solved the case in the end, and reminded Saguru that the detective's first job is to prevent death if he can. Heiji is also known to be extremely protective of those he values as close friends, and tries hard to keep them out of harm. There are several instances where Hattori tells Kazuha to wait for him or leaves her behind in order to keep her from being involved in cases, simply because he's afraid of her getting hurt. Furthermore, he's pretty much always watching Shinichi's back, and does whatever he can to not only keep Shinichi safe, but to keep his identity under cover. However, on one occasion Heiji advised Conan to tell the truth, when Ran had convinced herself that Conan was Shinichi and thus willingly gave him blood after being shot. Heiji occasionally enjoys teasing Shinichi's kid form. He has fun jokingly (sometimes mistakenly) calling Conan "Kudo" in front of Ran at his friend's expense. He often treats Conan/ Shinichi as a younger brother and their close relationship even evokes Kazuha's jealousy from time to time. In return Conan truly trusts and respects Heiji. Although he is very competitive when it comes to detective cases, when a case gets hot, he and Shinichi work effectively together. During Shinichi's first return to his high school during the play performance, Heiji had let him take the lead role in the investigations, saying that it was because they were in Tokyo, Shinichi's turf. Although he frequently mocks Kazuha for her superstitions and enthusiasm for good-luck charms, Heiji has several times revealed that he puts more trust in them than he would admit. He once dreamed of Shinichi being murdered, and out subsequently insisted that Conan wear his omamori, the good luck charm Kazuha gave him. The omamori ended up saving Shinichi's life by deflecting a knife blow, but Heiji, without his usual protection, was shot in the stomach.In another case, Ran hung a teruterubozu, a charm that's supposed to ensure good weather, in the window so that Conan would have good weather for his field trip the next day. Heiji, however, got up in the middle of the night to take down the teruterubozu so that Conan's field trip would be rained out and he could accompany Heiji on an investigation of the The Red Horse Among The Flames During the "Bond of Fire" case, Heiji questions Conan if they were right in stopping the culprit from committing suicide, leading to the latter responding that if a detective knows a criminal is about to commit suicide and does nothing to stop it, then the detective is no better than a murderer. Heiji takes to this heart, as evidenced by him stopping the serial murderer in the "Stabbed Wallet" case from committing suicide. His relationship with Shinichi/Conan from his end. In Heiji's first appearance, he traveled all the way to Tokyo to challenge Shinichi Kudo to a deduction battle so he could win and show he was the superior detective of the two. After Shinichi solves the case (which included correcting Heiji's wrong assumptions), the Tokyoite detective then gives a short speech to the Osakan that there's no such thing as the superior or inferior detective, only the truth; Heiji is left both speechless and amazed. Throughout his subsequent appearances,(which involved deducing "Conan's" real identity), Heiji may have kept his competitiveness towards his fellow detective, but he now considers Shinichi/Conan to be his partner and best friend, willing to do anything to ensure his happiness and safety.

Case Closed
Shinichi Kudou, a great mystery expert at only seventeen, is already well known for having solved several challenging cases. One day, when Shinichi sees two suspicious men and decides to follow them, he inadvertently becomes witness to a disturbing illegal activity. When the men catch Shinichi, they dose him with an experimental drug formulated by their criminal organization and abandon him to die. However, to his own astonishment, Shinichi is still alive and soon wakes up, but now, he has the body of a seven-year-old, perfectly preserving his original intelligence. He hides his real identity from everyone, including his childhood friend Ran Mouri and her father, private detective Kogorou Mouri, and takes on the alias of Conan Edogawa (inspired by the mystery writers Arthur Conan Doyle and Ranpo Edogawa). Animated by TMS and adapted from the manga by Gosho Aoyama, Detective Conan follows Shinichi who, as Conan, starts secretly solving the senior Mouri's cases from behind the scenes with his still exceptional sleuthing skills, while covertly investigating the organization responsible for his current state, hoping to reverse the drug's effects someday.