I think it's
Arya, from the Inheritance cycle of fantasy novels.
For the rest of it, SPOILER ALERTS!
Our life and death are one, we two
That's her and Firnen, her dragon. The bond between Rider and dragon is one of my favourite parts of those books.
Hair the color of rose's imperfection
She has black hair, and blackleg is a plant disease affecting roses.
Eyes like the one who is part of me,
She has green eyes, and Firnen is green.
Though we are two.
Two in body, but one in mind and spirit.
And the other of us is the color
Of his fallen relatives in the
Safest place on the earth(besides _________)
Firnen's relatives (other dragon eggs and Eldunari) are hidden away in the Vault of Souls at Vroengard, perhaps the safest place in the world besides the elven forest.
My family and I are celebrimbor,
This refers to family not in the literal sense but in the sense of dragon Riders. Celebrimbor was an elven lord in LotR whose name means "silver hand", as in Argetlam - dragon Riders all have silver on their hands from the gedwey ignasia.
But we are just my two brothers and me.
The only dragon Riders in existence are Eragon, Murtagh, and Arya ...
... but more will hopefully arrive when the other eggs hatch.
The first hint is now self-explanatory. For the second:
Not to be confused with Arya Stark, a character of the same name in a more recently written fantasy novel ("more modernly created world").