The pairing of Roy
Mustang and Riza Hawkeye from the manga and
anime, Fullmetal Alchemist. This pairing is know for exceptional
angst and symbolism. Most believe them to not be actively romantically engaged, but to be restraining their emotions for a better time and place than the current setting of Fullmetal Alchemist. It is generally considered that they are not sexually active with
one another, and it is debatable whether they ever have been. The word RoyAi comes from the Japanese characters of 'Roy' and 'Hawkeye' being combined, and the resulting sound is 'royai'. The correct spelling of this sound would normally be roiai, which is why occasionally you will see RoyAi refered to as RoiAi, however, most fans agree that RoyAi is a
pun of Roy+Ai (the Japanese word for
love)
Some pairings of Fullmetal
Alchemist include: RoyAi,
EdWin, RoyEd, Edvy, RoyMaes, RizaEd, and
many others.