Uliro

Uliro is the slash ship between Shiro and Ulaz from the Voltron: Legendary Defender fandom.

Canon
Disguised as a doctor, Ulaz helps Shiro escape. He uploads coordinates of the Blade of Marmora base into Shiro's robotic arm and sent him out in an escape pod.

While in a healing pod Shiro remembers Ulaz helping him. Using the coordinates he got from him, Shiro and the team head out to that location. There the ship is intruded by a mysterious person who reveals himself to be Ulaz after recognizing Shiro mid-fight.

Zarkon manages to track the paladins and sends the now Robotic Beast (RoBeast) Prorok to them. Voltron has a hard time keeping the RoBeast at bay. Shiro and team are saved by Ulaz, who sacrifices himself and his ship by crashing into the monster.

Fanon
Not exactly a rare pair, but a least favorable ship compared to others. Uliro has a small following.

Fandom
AO3

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Trivia

 * Ulaz only appears for one episode: "Shiro's Escape".