Gintaka

Gintaka is the slash ship between Sakata Gintoki and Takasugi Shinsuke from the Gintama fandom.

Canon
Gintoki and Takasugi are childhood friends and disciples of Yoshida Shouyo, they are also rivals that became enemies after the war due to the lot of tragedies and due to Gintoki killing their master to save Takasugi. After their fight and the revelation about their past they eventually become allies and friends.

One of the main things that made Takasugi suffer for so much time was the fact the last thing he saw with his left eye was Gintoki's crying face, that image being engraved in his mind for his whole life.

Gintoki states that Takasugi pointed his sword to him cause that was a self-punishment much more painful for Takasugi that simple killing himself, he felt like everything was his fault and the perfect punishment was killing his "other self" his "alter-ego".

Gintoki says that when he lost Takasugi, it was like he lost part of his soul, so now that they are together again he is finally complete and the reason he was there where they are was so he wont lose him again.

Gintoki says he and Takasugi "may be born under that kind of star" this line can and probably have a soul-mates meaning.

In his last moments, Takasugi begs to Gintoki to not cry, since the last thing he saw with his left eye was Gintoki crying face and it hurted him for his whole life, Gintoki smiles to him telling him to wait for him in hell and when Takasugi's eyes close he cries on his face.