Shadaze

Shadaze is the het ship between Shadow the Hedgehog and Blaze the Cat from the Sonic the Hedgehog series.

Canon
Shadow and Blaze mostly interacted in the Pre-Super Genesis Wave Sonic Universe comics. They first met when Shadow was fighting Metal Sonic and ended up in the Solution Dimension. Shadow almost drowned but was rescued by Blaze and Marine the Raccoon.

Shadow and Blaze met again when they were looking for the Solution Emeralds. While they were against each other at first, they eventually teamed up. At one point, Blaze was hurt and Amy ordered Shadow to carry her.

In the games, no notable interactions happened between the two but they met in a few games.

Fanon
Shadaze gained popularity when the pair interacted in Sonic Universe.

Trivia

 * Shadow and Blaze were both based on the same concept character.