Roulette

Roulette is the slash ship between Nagito Komaeda and Gundham Tanaka from the Danganronpa fandom.

Canon
Gundham and Nagito are both members of Class 77-B.

Despite Nagito's unsual behavior, it appears that Gundham is strange to even him. The other's eccentricity is something he implies he doesn't quite understand, however, he does help translate a few of Gundham's statements to Hajime during their first meeting.

When Nagito contracts the Despair Disease in the third chapter of the game, Gundham states that he would not care if Nagito were to die.

However, Gundham appears one of the few characters to understand Komaeda's grey morale, as opposed to many others who see his stance as black and white.

During chapter four, Nagito and Gundham are the only two characters to compete in and complete the Final Dead Room. This parallel conveys the intelligence shared by the two, and allows Nagito to convict Tanaka as the culprit. After discovering the secrets of the Final Dead Room, Komaeda appears arrogant and bored with Gundham's trial, and attempts to rush his execution out of his anger towards all the Ultimates.

Fanon
The ship sailed due to the parallels that exist between Nagito and Gundham's characters. While the two are at odds, they are both implied to be two of the most intelligent students in their class. They do not see eye to eye during the game, but Gundham's understanding of Komaeda's morality implies more understanding than a majority of his class have ever had with the Lucky Student.

Another draw is the similarities existing in their backstories. Both grew up relatively isolated without much familial guidance, Komaeda being an orphan while Tanaka was raised by his mother. They shared a distance from the children they grew up with, both being alone throughout their life.

Another parallel exists between them as they are the only two students to compete in the Final Dead Room. These similarities helped to fuel the ship in some small communities, causing some to wonder how the two's similarities and parallels could bring them together.

Fandom
FAN FICTION
 * Tanaka/Komaeda tag on Fanfiction.net

Trivia

 * Nagito and Gundham are the only two characters to compete in and complete the Final Dead Room.