For the homunculi, forever was just a fact. It was implied that they would be around forever. They did have to watch out, they could be killed. But... when you cannot die through normal means, forever was just a fact.

For an alchemist, forever was something to reach for. It was an ultimate goal embodied in a blood red stone. It was a forbidden concept that was just so tempting that everyone wanted it. Forever was also one of the greatest dreams of the alchemist.

For genin, forever was there. They were freshly graduated brand-new ninja and they thought they were the best. The feeling of immortality lent itself to the imagination and led them to making promises of love and devotion and forever.

For jounin, forever was... nothing. It had no meaning, no place in their lives. They made their living by killing people and not being killed by other people. When you could die every day on every mission, you tried not to think about the future, tried not to think about forever.

For the ANBU, there is no forever. It is undefined, absolutely no meaning. They had no faces, no identities. They were shadows, ghosts, nothing. And what is forever to something that technically doesn't exist?

Forever to Greed was something he'd be around to see.

Forever to Envy was something he wanted.

Forever to Edward Elric was restoring his brother.

Forever to Roy Mustang was changing the military and stopping the senseless violence.

Forever to Maes Hughes was his wife, his daughter and all the happiness therein.

Forever to Sabaku no Gaara was just himself, always.

Forever to Uzumaki Naruto was his face in the mountain where everyone would acknowledge him.

Forever to Rock Lee was a bright warm home where everything was just perfect.

Forever to Gekkou Hayate was something he didn't think about but was determined to see nonetheless.

Forever to Shiranui Genma was what lurked on the other side of all his missions.

Forever to Orochimaru was something he finally had but had to fight to keep.

Forever to Uchiha Itachi was just a dream for fools to follow.

Forever to Hatake Kakashi was just a word, perhaps in a foreign language that he heard or read sometimes but never actually understood.

Forever was everything and nothing and never and all the time and it was in everyone and anyone and no one at all and they loved it and hated it and craved it and needed it and wanted it and it was just something everyone knew and some of them believed in and some of them reached for and something they all talked about but never said a word and thought about but didn't spared a thought for and...

Forever just was.