Uliro

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

Season 2
In "Shiro's Escape," disguised as a doctor, Ulaz helps Shiro escape. He uploads coordinates of the Blade of Marmora base into Shiro's robotic arm and sends him out in an escape pod back to Earth.

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. Shiro is hurt by this lose.

In "The Belly of the Weblum," Antok mentions how Ulaz was right to trust Team Voltron, Shiro says, "He sacrificed everything to bring us together. Let's honor him by taking down Zarkon."

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 the episode "Shiro's Escape".