She is Nienna, the Lady of Mercy and she's a Vala(a goddess), Queen of pity.
She weeps constantly but her tears are those of healing and pity, not of sadness, and often have potency; for example, she watered the Two Trees with her tears, and later washed the filth of Ungoliant away from them once they were destroyed.
She was in favour of releasing Melkor after his sentence, not being able to see his evil nature.
I think that Nienna is really wonderfull she isn't the typical pain goddes loam and furious, she's calm and pious.
Eru is the supreme being, God. Eru is transcendent, and completely outside of and beyond the world. He first created a group of angelic beings, called in Elvish the Ainur, and these holy spirits were co-actors in the creation of the universe through a holy music and chanting called the "Music of the Ainur", or Ainulindall in Elvish. Eru alone can create independent life or reality by giving it the Flame Imperishable. All beings not created directly by Eru, (e.g. Dwarves, Ents, Eagles), still need to be accepted by Eru to become more than mere puppets of their creator. Melkor desired the Flame Imperishable and long sought for it in vain, but he could only twist that which had already been given life Eru created alone the Elves and Men. This is why in The Silmarillion both races are called the Children of Illvatar. The race of the Dwarves was created by Aule, and given sapience by Eru. Animals and plants were fashioned by Yavanna during the Music of the Ainur after the themes set out by Eru. The Eagles of Manwe were created from the thought of Manwand Yavanna. Yavanna also created the Ents, who were given sapience by Eru. Melkor instilled some semblance of free will into his mockeries of Eru Illvatar's creations (Orcs and Trolls).
other LOTR artwork of mine: :thumb324564146::thumb298350523::thumb211940262::thumb209201679: