Romania/Hungary is an uncommon pairing involving the characters Romania and Hungary. Widely-known as RomHun or RomaHun which was deprived from the first three or four letters of their names. It can also be addressed as Twilight Pair, which is an ironic reference from the triple-trilogy and highly-criticised Twilight series.
It is shown that Romania and Hungary both hate each other, especially when it comes to the Transylvania topic. They always end up in fights and must be torn apart by Bulgaria or from a third party closely involved. However on some rare occasions, they do get along well with no direct hatred being thrown at each other.
Most fanfictions personify Romania as a vampire while Hungary as a vampire hunter or a person that despises the supernatural kind.