Suegiku

Tetchouno is the slash ship between Tetchō Suehiro and Saigiku Jōno from the Bungou Stray Dogs fandom.

Canon
Their debut was in Chapter 60, in which all the members of the Hunting Dogs are introduced. Tetchō slices open the door of his transportation, believing that he opened the automatic door himself. Jōno mocks him for that idea and asks how long he'll hold the dramatic pose he is in. Tetchō calmly explains that he'll cut down anything in his way while Jōno humors him and exasperatedly tells him to go away.

They are both startled by Teruko shouting through her vessel, with matching expressions of worry or concern. Later, Jōno and Fukuchi are seen deliberating where the Detective Agency may be. Tetchō is apparently thinking about eating pudding and Jōno monologues internally that he hates the group.

In the next chapter, Tetchō and Jōno are partnered together by Fukuchi and are sent to capture the Armed Detective Agency. Two two dash off at extreme speeds, leaving the military guards astounded. They continue their banter in the forest, where Jōno voices his complaints about Tetchō cutting down every single tree in their way. He protests the stupid idea and bluntly says that he hates him because his soul had no artistry. At this point, Jōno mentions how Tetchō will only eat foods that are the same color together, with agreement from the other. Sighing with a completely fed-up expression, he wishes death upon the ravenette.

Continuing to criticize the latter's weaknesses, Jōno goes on about how he's useless except when facing the enemy, and that his heartbeat and breathing are incredibly annoying and should stop doing so at Tetchō's nearest inconvenience. Jōno lies on the ground to scout for any hints of the Detective Agency. Behind him, Tetchō is holding his breath, likely regarding what his partner had said. Towards the end of Chapter 61, Tetchō begins eating a hard-boiled egg with the shell still attached in order to "build his strength", which Jōno voices his disgust against.

In Chapter 62, the two are featured attacking the Armed Detective Agency together, and Kunikida even goes on to note the ability level of the Hunting Dogs. Jōno calls out for Tetchō to make Yosano's death quick, but before he can strike, his arm is pierced by a bullet from above. Jōno searches the skies for the culprit, only to find Chūya sending down thousands of bullets with his Gravitational Manipulation. Tetchō, losing his composure for once, stabs his sword through the side of the chopper and grabs onto Kenji.

Their next interaction is featured in Chapter 71, where Jōno welcomes Tachihara back and gives him the "Disciplinarian Role". He points towards a wailing Teruko and Tetchō who is exercising. During their meeting together, as Tachihara briefs them about the 'Decay of Angels', Tetchō is seen doing push-ups while in a meeting next to Jōno's chair. Getting annoyed by Tetchō's workout, Jōno steps on his head and says that muscle training is banned during meetings. Tetchō seemingly reacts as if unscathed, even going as far as to describe Jōno's weight as "just right".

Later on in the same chapter, they are shown entering Café Uzumaki together to gather information while arguing about who could be the "Greatest Hunting Dog" out of the two of them. Jōno reasons that because the Hunting Dogs is an organization based on investigation and capture, he is the one most skilled at them and should therefore be the strongest Hunting Dog. Tetchō watches him with a bemused expression for a moment before letting out a slight laugh (notably one of the only scenes where Tetchō smiles). Jōno reponds darkly, threatening Tetchō with imminent death. They take a seat at the bar with Tetchō ordering a soy sauce latte, which clearly annoys Jōno. Jōno proposes a battle: Which person can find out the location of the Detective Agency first? Tetchō agrees to the challenge casually, and Jōno immediately begins interrogating the barista.

Quickly, the simple questioning turns into Jōno taunting him with his own lies. Just as he is about to make the poor barista crack, Tetchō stabs Jōno's foot with his sword. Jōno shouts out in pain, questioning his motives. Tetchō reprimands him 'on the commander's behalf' and scolds his tendency to torment people. Afterwards, Tetchō vows to the barista that Lucy will receive no charges and that the Armed Detective Agency will receive a fair trial. An agitated Jōno asks what he's doing, attempting to stop him, but concedes to Tetchō's fair proposition in the end. He internally wonders if he lost the interrogation competition in the end.

They have a short interaction in Chapter 88 during the Vampire Infection arc, where Tetchō suggests that the source of the infection is the Armed Detective Agency, being the timing. Tetchō's speech triggers Jōno to sarcastically compliment him for his idea, saying that he'll mark Tetchō's being reasonable for once on his calender. Tetchō is seemingly unfazed by this.

After Jōno bumps into Aya during Chapter 92, he begins threatening her life and questioning her, asking her if she would like to "become a part of his entertainment", However, Tetchō intervenes, telling him to stop by lengthening his sword and hitting Jōno. Tetchō chastises him for using innocent people as pleasure, in which the white-haired man remarks angrily that Tetchō could've just used his voice instead of poking him in the ass every single time. Jōno lies that he was only looking for cooperation, in which Tetchō disagrees and say he should only do such after the girl had signed a consent form for Judicial Transactions. Ticked off, Jōno provokes Tetchō into settling the debate by blade, but they're both stopped by Fukuchi.

Fanon
Like most ships in the Bungo Stray Dogs fanbase, it's most popular for its "" or "" appeal, much like the more popular ships such as Soukoku or Shin Soukoku. There is one character with a smarter mind and a calm composition, while the other one is more battle-oriented and is good in combat.

They are both members of the Hunting Dogs, and commonly get paired together in missions. They have likely known each other for an extended amount of time as well. Jōno claims to be the "Strongest Hunting Dog", in terms of his expertise in catching criminals and investigating, but the manga cites that Tetchō is actually the strongest soldier, in terms of pure fighting ability. Both of them seem to hold no hesitation in actively harming the other, as Jōno commonly threatens Tetchō with death, and Tetchō is quick to attack Jōno if he is acting too sadistic.

The ship itself doesn't have many other contenders, but it doesn't have an excess of content either because they are more newly-introduced manga characters. Most fanfictions are AU's or set before the Hunting Dogs arc because of Jōno's death.But it's also noticeable that it is the most popular ship for both Tetchō and Jōno on the Bungo Stray Dogs AO3 tag, only having 80+ works.

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Trivia

 * Tetchō's birthday, March 15th and Jōno's birthday, September 24th, are 194 days away from each other.
 * This makes Tetchō a Pisces and Jōno a Libra.
 * Both are often paired together during missions.