Hideyoshi Nagachika

Hideyoshi Nagachika (永近 英良, Nagachika Hideyoshi), also known as Hide (ヒデ), is a normal human and the best friend of Ken Kaneki.

He was a freshman (sophomore as of chapters 80's) studying at the Department of International Studies of Kamii University.

Also, he was working part-time at the CCG starting from a certain point, and soon became an investigation assistant helping both Koutarou Amon and Akira Mado.

He disappeared during the Owl Suppression Operation, and his whereabouts are currently unknown.

Appearance
Hideyoshi is a young man of average height that has short, messy, dirty blonde hair with dark roots and brown eyes. He tends to wear bright colored clothes that consist of a yellow varsity jacket and green shorts. Because of his love for music, he is usually seen  wearing a pair of headphones around his neck.

After the Aogiri arc, he lets his hair grow out, and most of the time he is seen wearing a red and white cap, and he no longer wears headphones. He's mostly seen in a light-blue jacket over a white dress-shirt with red collars. He also carries around a green bag, black pants and green shoes, aligned with yellow.

During Owl Suppression Operation  he was shown wearing military CCG uniform consisting of black long-sleeved shirt,gray vest and black trousers.

Personality
Most of the time, Hide has a carefree attitude, always joyful and friendly, which greatly annoyed Nishio. However, Hide is actually incredibly observant and can figure things out about people in an almost Sherlock-like manner. He also becomes interested in things and works hard on them until he finds something else to interest him. Hide claims to have a habit of pretending to be a detective by putting tracking devices on suspicious people and notifying the authority if his intuitions turn out to be right (however, the "hobby" part of it is most likely a lie he made up to hide his true motive from the CCG, which is to find clues about Kaneki's whereabouts).

Hide also has a very "determined" behavior. When he's set goals or decisions, he'll stick to them to the very end.

He is shown to have a good connection with Kaneki, encouraging him about many things and worries when he doesn't return his calls. Hide is also shown to be the opposite of Kaneki in some cases; as he is the type for festivals while Kaneki doesn't favour it.

Though he is loud and outspoken, Hide is usually found keeping most of his concerns to himself in order to not trouble those surrounding him.

Just like his best friend, Hide has a habit of placing his hand on his face when he is nervous or is lying.

Prologue
Hide appeared first with Kaneki at Anteiku in the 20th Ward listening to news about ghouls. He asked Kaneki about the girl he had been talking about and pointed if the waitress, Touka, is the one but Kaneki denied it. Then Rize Kamishiro, the one Ken got a liking to, entered the cafe. Hide left the cafe after seeing the girl he had come to see and went to work.

After Kaneki's incident with Rize, Hide invited his friend Kaneki to Big Girl Restaurant for dinner. There, Hide commented how nice Ohashi is. Hide soon talked about Prof. Akihiro Kanou's decision to save Kaneki with Rize's organs but then apologized thinking how it was tough for Kaneki to lose the girl he started going out with. While eating, Hide got surprised at his friend's vomiting the food.

After Kaneki had disappeared for a long time, Kaneki finally went back to Kamii University. Hide yelled at Kaneki for how long he had disappeared. Then, events made them end up visiting Nishiki Nishio in the university to get the DVD of last-year's college festival, they disturbed Nishiki and Kimi Nishino when they were making out. Kaneki discovered that Nishiki was the ghoul that attacked him shortly before. Nishiki told them to help him look for the material, but then claimed that he took the disk home. He proposed that they should go to his home. In reality, he deceived Kaneki and Hide, took Hide out and started fighting Kaneki. He provoked Kaneki by standing on Hide's face with his foot, but Kaneki was no match for Nishiki with kagune. However, when Nishiki tried to kill Hide, Kaneki made his kagune come out. With his kagune, Kaneki heavily injured Nishiki. After that, Kaneki started to lose control over himself and was about to eat his own best friend Hide, but Touka appeared and decided to help him.

Later, Kaneki found himself inside Anteiku, where Yoshimura lead him to his friend that was lying there, seemingly unconscious. Kaneki noticed blood inside his mouth and realized that he ate human meat, so he went and asked Yoshimura about what he has done and the manager replied that there is only one way to calm a hungry ghoul. Kaneki said he wanted to be with his friend but he couldn't. Kaneki cried out that he was neither a human nor a ghoul and there was no place for him, however Yoshimura replied that he was wrong and there are two worlds he belongs to. Yoshimura asked him to join working in Anteiku while he would teach him how to live as a ghoul. It was implied that Hide was conscious and listening to Kaneki's discussion with Yoshimura.

Doves' Emergence
Hide paid him a visit when he found out that Kaneki started working part-time in Anteiku. Hide spoke out that he also came to thank Touka for nursing Kaneki and him after a car accident, a story told to him by Anteiku's manager to cover up Kaneki and Nishio's fight. After they had left Hide, Touka told Kaneki to make sure that Hide won't find out about him being a ghoul because she would kill him if that were to happen, so that the ghouls' identities wouldn't be found out. Later, Kaneki and Hide were seen sitting together at the university. Kimi approached them to give Hide the materials of the previous year's festival. Hide asked Kimi where Nishiki was hospitalized, but she didn't answer. Then, Hide made a remark about Kaneki's scary face, who was wondering whether Kimi was a ghoul or not.

After Mado's death, Kaneki went to his university. In a class, Hide started talking about the news of the death of two ghoul investigators. Kaneki asked Hide why he was interested in such things, then Hide showed Kaneki Ogura's newest book and said it was "super interesting". Hide talked about joining the investigation, but Kaneki told him not to do so because it was dangerous. After that, Hide is shown drinking a can of coffee and commenting on its bitterness.

Aogiri Arc
Shortly after Kaneki was kidnapped, he sent many e-mails to him in worry while watching news about changing statuses in Tokyo and the 11th Ward.

Hide appeared once again watching news about the 11th Ward Special Countermeasures Unit attacking the Aogiri hideout while he was taking some notes.

Raid of Kanou's Lab
After the invasion on Aogiri Tree, it was revealed that Hide was the one who notified the CCG 6 months prior to the event by coincidentally tracking Yamori while performing his detective hobby. After applying as an office assistant at CCG, Marude questions him about whether he was the one to notify them of Aogiri Tree's base location and how he knew about it. Finding him promising, Marude then orders Amon and Mado's daughter, Akira, to take him away as a new investigator assistant. It's revealed that he joined the CCG in order to find clues about Kaneki's whereabouts.

Anteiku Raid
After Kaneki's victory over Amon and his new quinque, Kaneki escapes to the sewers in order to get to Yoshimura. It was during this time when Hide appeared and revealed that he knew about Kaneki being a ghoul. Despite that, he still wishes to help him and asks him whether he can go all out once more to escape the CCG raid. Kaneki blacks out, and when he awakens, Hide is gone and the taste of blood is in his mouth. It is unknown whether an out-of-control Kaneki ate him or not.

Root A (Anime)
Hide appears during the Aogiri Raid, looking for Kaneki with a pair of binoculars, and finds him battling against Ayato to protect Touka and the others. Later, he is shown working as a part-timer at CCG, trying to extract information about Kaneki's whereabouts, mostly from Takizawa and the other Investigators.

By chance, Hide encounters Touka when she was touring Kamii University. The two sat down and chatted about Kaneki, with Hide reminiscing and explaining to Touka about what sort of person he was in the past, and shows that he is worried about his friend. Touka attempts to cheer him up, saying that he is probably reading a book somewhere. Hide smiles, and agrees with her. When he leaves, he tells her about Kaneki's habit of touching his chin when hiding something.

Back at his house, he is seen holding up the missing persons poster showing Kaneki, commenting that Kaneki shouldn't make a girl like Touka worry about him so much. He is also later shown back at CCG, still collecting information about the Eyepatch Ghoul (Kaneki). It isn't until during the Anteiku Raid that he is shown again, this time dressed as a CCG soldier.

He spends most of the battle sneaking around, overhearing conversations between soldiers and worrying about Kaneki. When Aogiri joins the battle, he is caught in the ambush and witnesses Noro attack Takizawa. The Ghoul catches sight of him, though he seemingly escapes from the battle. Later on, he finds a wounded Kaneki outside of Anteiku and brings him inside the cafe. He attempts to make coffee for them both, and greets his old friend as though nothing has happened.

Apologizing for the unpleasant taste of the coffee, he talks about the past and reveals that he was awake during the battle between Kaneki and Nishiki. He reassures him that this doesn't matter, and the two begin to relax. It is then that Hide collapses on the ground, revealing a severe stomach wound from earlier which he attempts to joke about. Bleeding out, he clings to Kaneki and asks that they go home. Anteiku begins to burn around them, and after a brief time Kaneki carries his lifeless body back to where CCG has established a base camp. The troops look on in shock, and Kaneki lies Hide down in the snow before going to face Kishou Arima.

Ken Kaneki
Kaneki calls Hideyoshi by the nickname "Hide". Kaneki and Hideyoshi have been best friends since childhood. Hide seems to care greatly about Kaneki and had been watching him carefully after the incident with Rize. If Kaneki was in trouble or danger, he would do his best to support him. He cares for Kaneki immensely, and did not falter to help him even after finding out about Kaneki's transformation into a ghoul. It is speculated that Hide was eaten by Kaneki during the Anteiku raid, however, this has not been confirmed.

In the anime, Hide was injured before meeting Kaneki during the Anteiku Raid, likely by Noro, and ended up ultimately succumbing to his wounds. Kaneki was later seen carrying his body, covered by a white sheet, as he walked through a crowd of Investigators.

Nishiki Nishio
He seems have Student-teacher relationship with Nishio but stated himself that he most likely hates Nishio, saying that he is poisonous to be around whilst Nishio is equally cautious of him due to his very keen intuition and see's him as being dangerous to be around as he explained to Kaneki regarding his ghoul identity being a secret.

Touka Kirishima
Although they don't know each other well, Hide is on friendly terms with Touka, and believes she's cute. At Kamii, he spoke briefly about his and Kaneki's past, and gave her a tip on how to tell when Kaneki was hiding something.

Koutarou Amon
Hide worked under Amon and Akira when he joined the CCG.

Akira Mado
Hide worked under Amon and Akira when he joined the CCG. Akira seemed to have been suspicious of Hide, as she noted that he was strangely perceptive when asked about the mother and daughter ghouls' relationship to the Rabbit ghoul.

Seidou Takizawa
Hide had a friendly relationship with Seidou, occasionally eating lunch together in the CCG building.

Itsuki Marude
Hide was assigned as inspector assistant under Amon and Akira by Marude, who found out about him being the informant for the Aogiri Tree base location. He jokes around Marude sometimes, such as when he mentioned that committing suicide is bad when given an empty will before the Anteiku raid.

Powers and Abilities
Hide has proved to be very perceptive for a human, being both able to distinguish Kaneki's changing feelings, and sense Nishio as dangerous despite not knowing Nishio was (in fact) a ghoul pretending to be human.

Trivia

 * Hide was ranked 4th in the latest character popularity poll.
 * In Chapter 83, the number "1" is on Hide's hat. This is a reference to the tarot card The Magician (I).
 * Hide's voice actor Toshiyuki Toyanga had auditioned for the role of Kaneki. Towards the end when there was three minutes left, he was surprised when the staff asked him to "act like you're suffering". He didn't get the role, however the staff asked if he wanted to play Hide instead.
 * In Tokyo Ghoul Trump, he's featured as the "Ace of Spades".
 * Hide has a poster for Red Dragon in his room, the prequel in the Hannibal Lecter trilogy.

Quotes

 * To Ken: "I already knew man! ...Who cares about that, let's just go home already."
 * To Ken: "I...I want to help you!"