This pairing was from Avatar: The Last Airbender.
At the beginning of the program this seemed an unlikely pairing as both characters were on opposing sides. However later on when Zuko helps Aang's group, Toph is the first to accept Zuko.
As seen in the image to the right when Toph grabs Zuko's farm he blushes furiously. The two get along quite well and had several similarities (such as being tough teachers). Possibly one of the cuter possible pairings but not as popular as Kataang or Zutara.