Prussia/Canada

Prussia/Canada is a pairing involving the characters of Prussia and Canada.

The only actual canon interaction the two had was when Prussia hacked Kitayume and made it his blog during April Fools '09. Canada arrived, claiming that "Maple syrup surely brings happiness to the people who eat it", and gave Prussia, who was skeptical, a bottle for free. After tasting the syrup, Prussia stated that he enjoyed it.

It should also be noted that Prussia actually remembered Canada, and never mistook him for America.

Factual Truth
There is actually a historical link between the countries of Canada and Prussia. Years ago during Prussian conquests, at some point they made contact with Canada. Now in the modern world there is an actually geographical location called New Prussia in Wilmot Township, Waterloo Region, Ontario, Canada.

This piece of infomation is commonly used by fans in fanfictions to further strenghten the relationship between Gilbert and Matthew