SinJa

SinJa is the slash ship between Sinbad and Ja'far in the Magi: The Labyrinth of Magic fandom.

Canon
Sinbad is King of Sindria and Ja'far is his right hand and adviser for the most of the series.

Magi: Adventures of Sinbad
First time they meet in the beginning of the Adventures of Sinbad when Sinbad was 14 and Ja'far was 10. They met because Ja'far was an assasin and the leader of his trope and got an order to track down and capture Sinbad from Parthevia's Emperor. He failed his mission and decided to become his ally. At first, he laughs at Sinbad's desire to establish a country that will change the world, and even asks if he is sure that he wants to take a person like him as an ally and state that Sinbad is a "really interesting guy". After Sinbad saves his life in the dungeon, he joins him and becomes his subordinate.

They become close friends and travel together with their other friends. Ja'far helps Sinbad achieve his dreams to build a country. Ja'far is already close enough to Sinbad to call him by nickname "Sin" which no one else but him uses. Since then they become companions who care for each other, Ja'far is often appears as an advisor to Sinbad in various situations, even thoogh he is younger that Sinbad. Sinbad builds a kind of carefree behaviour, for instance when he gets drunk and dissolute, Ja'far gets angry and tries to scold him. Also, in one of the chapters, we can see that Sinbad's inner voice has the appearance of Jafar. Ja'far is utterly loyal to Sinbad and has a strong faith that Sinbad can achieve his goals even if Ja'far dies. Sinbad, in turn, entrusts the management of the trading company and the country to Ja'far in his absence.

Magi: The Labyrinth of Magic
In the beginning of the main series Sinbad is King of Sindria, the Leader of the Seven Seas Alliance, as well as the president of the world's most powerful trading company, the Sindria Trading Company and Ja'far is the right-hand man of Sinbad and one of the Eight Generals of Sindria Kingdom. They seem close, Sinbad confide to Ja'far his thought and ideas and Ja'far sometimes can predict Sinbad's direction of thoughts. Ja'far is ready to defend Sinbad when someone is doubting his authority, just like in Balbadd Arc when Cassim accuses Sinbad and the rest of royalty of trampling on inferior people to survive, and wanting them to die from starvation and says that he want to only live his life in luxury, Ja'far attacks Cassim and calls him an ignorant thief who know nothing about Sinbad's sacrifices, but Sinbad stops him.

By the Final Arc after five years since the beginning, Sinbad is no longer King of Sindria, he is the Head of International Alliance and CEO of Sindria Trading Company, Ja'far is the Chief of Sindria Trading Company. Ja'far works as Sinbad's secretary (though Arba is now Sindria trading company's top advisor). When Sinbad decides to enter the Sacred Palace, Ja'far is shown when he went to Sinbad's office late in the night, and sees Sinbad getting dressed. When Sinbad is telling Ja'far that he is willing to "reshape the world" and leave the trading company to him, Ja'far seems very upset and confused. He tells Sinbad that they have achieved their dream about building a good country and tells him that he's acting like an idiot and making a weak action by runnung from present reality. He tries to convince him not to risk his life. Sinbad tells him that he'll get a grip and understood his point of view, but after that he still does what he wanted to do. After Sinbad overwritten Rukh, everyone, including Ja'far, is in solidarity with Sinbad's desire to return to the Great Stream.

Right before he vanishes in singularity, Sinbad regrets what he did, remembering his friends (including Ja'far) and thinking about how much he didn't get to do. At the end Ja'far says that he knows Sinbad will be back someday, showing his hope for that.

Quotes
"We were nothing but small merchants, thus, now we are the King of the Kingdom of Sindria and its minister..."

- Ja'far to Sinbad in Vol.19 Chapter 182 of The Adventures Of Sinbad

"Sin, I know that you will be back some day."

- Ja'far in Magi: The Labyrinth of Magic, Vol.20 Chapter 369

Fanon
SinJa is one of the most popular ships in Magi: The Labyrinth of Magic global fandom since it was formed. In fanon this ship appears as a very light and fluffy but tragic at the same time due to Sinbad's death at the end of the series. Fans really enjoy their concept of teenage friends coming of age and growing together. Many fans say that they have married couple dynamic because of their long-lasting close relationship. They have kind of opposite personalities, which attracts fans too.

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WIKI

Sinbad's Relationship with Ja'far on the Magi: The Labyrinth of Magic Wiki

Ja'far's Relationships with Sinbad on the Magi: The Labyrinth of Magic Wiki

Trivia

 * It has been stated in the Magi Official Character Guide Book that Ja'far loves the kingdom of Sindria and Sinbad more than anyone else.
 * Sinbad is based on Sindbad (Arabic: السندباد البحري, as-Sindibād al-Baḥri; Persian: سندباد, Sandbād), the hero of Sinbad the Sailor from the One Thousand and One Nights.
 * Ja'far is named after Ja'far ibn Yahya, Grand Vizier of Caliph Harun al-Rashid from One Thousand and One Nights, who in turn was based on a historical figure.