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Dr. Tenma said tomorrow will be a good day.

–Dieter

Dieter (ディーターDītā?) is the only remaining child under the care of Mr. Hartmann. Hartmann was trying to continue the Kinderheim 511 experiments on him, until Dieter was found by Dr. Kenzō Tenma and was rescued. Thereafter, Dieter would accompany Tenma as a faithful and steadfast companion in his journeys and regard him as his best friend, despite Tenma's desire for him to be given a stable life. Later, as their travels progressed, Dieter would encounter and assist a wide variety of other people, such as Nina Fortner, whom he also befriended and stayed with.

Appearance[]

Dieter is a young boy with short red hair, blue eyes, and pale skin.

Personality[]

Despite his young age, Dieter is an intelligent and resourceful boy. He becomes Dr. Tenma's assistant in his search for Johan and helps him in his investigations. He views Dr. Tenma as a mentor and father figure and strives to follow in his footsteps.

Dieter also serves as a foil to Johan. While Johan is cold and calculating, Dieter is full of empathy and emotion. He cares deeply for the people around him and is willing to put himself in danger to help Dr. Tenma. Dieter's relationship with Johan is also complex, as he struggles with his loyalty to his friend and his growing understanding of Johan's true nature.

Biography[]

Meeting Kenzo Tenma[]

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Dieter lived with Hartmann, a former director of the East German orphanage "Kinderheim 511", who was trying to transform him through abuse so that he would resemble Johan. As a consequence of that, Dieter developed an insecure personality which is shown in his first encounter with Tenma. Shortly after this encounter, Tenma discovered bruises all over Dieter's body and concluded that he was a victim of abuse from Hartmann. Tenma takes him to a hospital and leaves him on guard to nurses for a few hours. However, Hartmann comes to Dieter's room and takes Dieter with him. After Tenma's visit to the orphanage Nina enrolled, he returns to the hospital to pick up Dieter but finds out that Hartmann had already done so.

Tenma finds them and sees this scene: Dieter in a tall royal-like chair and Hartmann, standing behind him, presumably as a manifestation of Johan overseeing the chaos, the event from 1985. Tenma successfully convinces Dieter to leave Hartmann for good, which greatly distresses his foster father.

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The following day, Tenma gave Dieter a registration form to give to Erna Tietze so that Dieter could enter orphanage 47. Dieter refused to leave Tenma and started his journey alongside him, serving as his companion.

"Main dish"[]

In Frankfurt, Tenma temporarily leaves Dieter in the care of Otto Heckel. The two wander around the city for some time but don't get along well, so they part ways. Dieter eventually runs into a Turkish prostitute who is caring for her friend's baby. He learns from her that her friend, Ayşe, has been captured. When Dieter offers to help and inquires about the location, she warns him against it, as it would be too dangerous. She explains that a certain Asian man she met in the area was hit by a car, and Dieter realizes she's talking about Tenma. He gets the location from her and starts searching for Tenma, but is captured by one of the Baby's men in the process.

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He is brought to the place where Tenma is being interrogated by the Baby. Tenma initially denies knowing Dieter to protect him, but begins to panic when the Baby orders one of his men to kill Dieter. Before the henchman can do so, he is shot dead by one of General Wolf's men, who are present at the scene, with the reason given that Tenma is a "special guest" of Wolf and is undeserving of this treatment.

Wolf's men take Dieter and Tenma in a car to Wolf's residence. Dieter demands they let him out of the car so he can warn the Turkish quarter of the neo-Nazis' plan to burn it down. Wolf's men refuse, as it would be going against their orders. Tenma then threatens them with a gun to stop the car, allowing Dieter to leave and begin making his way to Frankfurt.

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Back in Frankfurt, Dieter meets Heckel in Brücken park and tells him about the plan, but Heckel sees this as a chance to steal an expensive rug. Naturally, Dieter is irritated by his opportunistic immorality. Their noisy bickering is overheard by neo-Nazis who happened to be nearby, and they are promptly captured. The two are locked in the ground floor, as a building is going to be swallowed in flames, anyway. Nina arrives at the restaurant where The Baby dines. She forces him to tell her the location of where his "main dish" will appear. The Baby tells her instead a "decoy" building and luckily guess the location where Heckel and Dieter are being kept. The things are getting worse, fortunately Nina arrives in time and rescues them. Now, the trio must find the main base where the chaos would start from. Heckel reveals that he knew this place very well because he grew up there and says that this building was just a decoy. He says that the starting place will be the riverside factory where the breeze will begin soon. Nina and Dieter head there, while Heckel goes for the rug. Dieter and Nina appear there in warehouse and see a gasoline spilled on concrete. Nazi appears and encounters them.

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Meanwhile, Tenma learns from Turkes that the other evacuation spot is the mosque by the river. By the way, he stumbles upon Heckel and demands from Heckel to reveal the location of plan starting. They appear near the warehouse and attack from behind one of the Nazi guards. Heckel ties him and Tenma goes to the warehouse. Nina threats Nazi with gun and guy is attacked from behind by Tenma, but lighter falls from his hand and falls right into the gasoline. Dieter grabs rug from Heckel's hands and put it on a path. Cops soon arrive and arrest the Nazi. Tenma, Dieter, and Heckel escape on a boat and Nina tells Tenma the message about Johan having "two personalities".

Tenma, Heckel, and Dieter soon arrive at the ruins of the Hilden and Engels warehouse in Romberg. They climb to the top of the building and see Johan's message: "Hilfe! Das Monstrum im mir wird explodieren!" (English: Help! The Monster inside me will explode!"). Tenma comes to the conclusion of what Nina said earlier about the two personalities Johan has.

Journey to Freiham[]

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Tenma and Dieter parts ways with Heckel and the two head for Bayern. There, they hitch a ride with an elderly couple from England, Mr and Ms. Jones on the way to Freiham. The thing is, husband used to be a policeman and has his old habit of analyzing strangers whenever, he is with them. Tenma finds this quite inconveniently and wonders if the couple plans to turn him in.

A while later, car is out of gas and luckily, a truck appears and offers a room for two. Couple says that Tenma and Dieter shouldn't go out of their way to help them. Tenma makes a promise that they'll find a nearby gas station and tell them what happened here. Tenma and Dieter have troubles with finding gas station and it's getting late.

Meanwhile, couple talks about Tenma. Husband wonders if he would fulfill the promise, however Leia, his wife believes he would. When they notice a beautiful sunset they are reminded of their son: Robert.

Dieter and Tenma appear with gasoline and together with them go to a restaurant. Mr. Jones reads newspapers and asks Tenma what he thinks of Scottish criminal. Jones unconsciously intimidates Tenma by telling him about his police skills and recognition of people at first glance. But the elder falls right into depression when tells that he isn't able to do that anymore and thinks he didn't make an excellent officer then.

Later, couple and the duo take a ride around the town and Tenma gets panicked when sees that the elder turned to the police station. A police passes by car and sees Tenma but doesn't recognize him. Couple returns from station and head to an unknown place behind Freiham, what keeps Tenma and Dieter confused. Husband apologies for taking their time and tells that he just wants to visit Steinbach castle.

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Old lady tells that their son wanted them to see a view from that castle, telling that it is a gorgeous view from the castle. Husband says that the son gazed out upon the scenery and that his son is the murderer. One of the reasons his wife and he came to this country was to visit him.

They all later leave the castle and say goodbye to each other.

Mr. Jones tells Leia that Tenma is the wanted criminal and that he saw his picture at the police station. Leia doesn't believes that but looses hope when Jones tells her that he saw him on the picture of wanted criminals at the police station. However, Jones finally releases all of his suspicions toward Tenma as he seemed to have all this time and clearly says that he believes in Tenma's innocence. This cheers Leia and she says that too. Jones also believe that Robert, their son is a good person and admits that the reason he quit being an officer is because he believes his son didn't murder anyone. 

Dining table[]

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Tenma accepts offer from Heckel to treat more people of underworld marketing. One of the patients is a mob boss, Mr. Heitmeyer who had been shot and currently is hiding out in his country home, hidden in the woods of Füssen. After Tenma treated him, Heckel prepares to make some delicious meat. Dieter is playing around and passes by Helmut, bodyguard of Heitmeyer. However, Helmut doesn't respond to any of Dieter's words nor his request to come for lunch.  The group lunchs and Heitmeyer talks about money ruining people, as it happened to him. Topic skips to money laundering as Heitmeyer  started telling the story about young man leading a large trading organization that monopolized black markets. Money made from illegal activities would pass through the "bank", organization created, money would become clean and legit.

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That manipulation later proved to be highly successful. However when the man left the syndicate, greed has spreaded among the majority of people who remained and they all ended being killed and the organization was destroyed. Organization was based in Düsseldorf but the leader gave orders from different locations as he moved from city to city. Heitmeyer says that the "kid" was only fifteen years old when creating the organization and that he might be a student now somewhere. Tenma concluded that the young man is Johan and learned from Heitmeyer that the man left for Munich after giving the last order. Dieter recommends to call for Helmut to join them in lunch. Heitmeyer sent Dieter there. At the same time, Roberto and Eva enter the zone. Roberto kills Helmut and gives Eva a gun. Heitmeyer's transceiver makes a sound sign that means something has happened to Helmut. Tenma is even more worried

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when hears from Heitmeyer that Helmut is probably dead. Tenma heads down to the forest to find Dieter. As Dieter is going, he sees Eva but get feared after seeing a gun in her hands. Properly opposite to Roberto's expectations, Eva tells Dieter to go warn the others at the mansion. When she is shot in the leg, Dieter refuses to continue his way and instead comes back to drag her out from Roberto's view. Dieter put her to rest by a tree until Tenma appears and treats her. Roberto misplaces far away from the forest. He was using an aimlessly woman like Eva more of a backup-entering card for mansion but since she betrayed him, the plan fell apart and he left. Roberto alone, couldn't break into the cottage due to a large number of security systems and armed men. In the end, Tenma, Dieter and Heckel left for Munich. Particularly Tenma to find Johan.

Julius Reichwein[]

Tenma and Dieter meet with Dr. Reichwein in Munich. By the help of his friend Otto, who works at the restaurant, Reichwein arranges Tenma a room in the attic that will serve as his hideout, while he is in Munich. Tenma learns from Reichwein that Johan periodically works as a secretary for Hans Georg Schuwald, the mayor figure for business in Bayern. As Tenma learns where Johan goes daily with Karl Neuman and Schuwald, he leaves the hideout and goes on his own to pursue Johan. Before he vanished, Tenma sent Dieter to live with Reichwein. Dieter realizes what Tenma attempts to do and begs Reichwein to stop him.

A child's view[]

Several kids have died, playing the game on the top of buildings. One of Reichwein's patients is a boy Martin who had survived by hitting the first floor awning and landing into the bushes. Reichwein left the room to talk with the desperate boy's mother and tells Dieter to watch over the boy. Dieter enters the room and acquaints Martin. Martin tells him to hand him, his shoes. Martin attempts to leave the room and Dieter tries to prevent him but fails. Eventually, Dieter leaves the hospital with him. The two start heading toward the city.

Martin tells Dieter that life is boring. Along the way, he shows Dieter characteristics heavily influenced by the ones that Johan possesses. He feels enjoyable whenever he intimidates people to feel the ultimate fear. As he did, when an elder was passing by and got stumbled by Martin's stick. Martin pushed hard his stick onto the elder's temple putting him under the high pressure. Martin gets arrogant about this and claims that he will spare his life and moves his stick. Dieter is terrified by Martin's actions. Martin's horrible characteristics have developed due to his overtime friendship with Johan.

Before they reached their location, brainwashed Martin jaywalked, claiming that the "death" isn't something to be feared of, in a boring world like this. Dieter however refused to copy Martin in doing such a dangerous things. Martin finally lead Dieter to a high building. As expected, Martin walks upstairs, but Dieter gets scared as he knows what Martin knows. Martin urges to come with him and succeeds in it. When they come to the top, Martin, staying on the edge, starts explaining Dieter the rules of the game. Dieter tries to convince Martin to stop playing the game and tells him the lighter sides of life that Tenma taught him. Martin just responds by saying that he is the weakling. Suddenly, wind blows and Martin lose the balance, causing him to fall off the edge. Dieter catches his hand and drags him out. Martin finally admits that he is feared of the game but also sadly admits that he can't be like Johan. Martin is teared up when tells that the one who taught him this game is Johan and that Johan will be shot by the asian man. Martin and Dieter return to the hospital afterwards.

Hans Georg Schuwald's book donation ceremony[]

Reichwein sees the newspapers about Schuwald holding a book donation ceremony at the library of Friedrich Emmanuel in the University of Munich. Reichwein tells Dieter to stay at home, but Dieter goes with him anyway.

Nina accidentally meets them in front of the university. A smoke is seen coming out from closed windows. All of the doors are locked. Dieter calls fire department. Nina crashes the window with extinguisher and enters the chaos by herself. She fails to shoot Johan and ends up, injured in hospital. When she comes back from the hospital, Dieter offers her some Kaiser Semmels and spends some time with her talking about Tenma.  

Nina Fortner[]

Nina is taken under therapy with Dr. Gillen and Dr. Reichwein to find out more about her memories. She remembers the Three Frogs and decides to go to Prague. Dieter wants to see Tenma and decides to leave with her.

The Doors to Nightmares[]

Nina feels that something is odd when hears that residents call her by name "Anna". Dieter is confused. The two accidentally arrive in front of the Three Frogs and Nina slowly starts to recall some of her memories and is sure that she knows the Three Frogs building and the mayority of the Michalská area from before.

Nina and Dieter enter the Three Frogs building. Nina recalls the stairs and her "brother" who was taken away. Upstairs, she enters the empty room and feels scared. Dieter doesn't understand her trembling as he sees there's not a single subject in the room. Dieter tries to convince her to give up from trying to reach the memories. Nina remembers Johan's description of the Red Rose Mansion and its location. She continues laundering with Dieter behind, still confused about her. They finally find the mansion. 

After some time, they stumble upon the doors that are sticked in the middle of wall. Nina recalls the room full of dead bodies and faints. The room is empty and Dieter is shocked when sees Nina unconscious. Dieter gets panicked, eventually an unknown man appears and along with Dieter took her to the hospital.

Three months passed, Nina and Dieter were living with Jaromír Lipský. He is the one who met Dieter in mansion and with him, took Nina to the hospital.

In the epilogue, Dieter is seen waiting for Tenma to return back home from Doctors Without Borders.

Relationships[]

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Kenzō Tenma[]

Dieter considers Dr. Tenma to be his best friend/parental figure because he rescued him from an abusive home.

Nina Fortner[]

Julius Reichwein[]

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