In Ikaruga, a young girl was discovered among burning fields and saved. She was later adopted by Vermillion's family due to her impressive combat abilities. As a result of her outstanding performance, she rose through the ranks of NOL and became known as "Arcus Diabolus Bolverk" using her Nox Nyctores revolver. Despite being made Jin's subordinate, he treated her poorly because she resembled Saya. When Jin left to hunt Ragna without permission from NOL, Noel was tasked with stopping him and returning him to his post at the Library. She is easily swayed by small animals and has a complex about her bosom. In one story path, Litchi convinced her to dress up as a panda and play with Lao Jiu, prompting her to shout "Hands off the panda!" during battle.
After realizing that Jin has left the hospital he went to after the injuries received by Ragna near the end of Calamity Triggers True End Story, Noel sets off to find him on her own accord.
In truth, Noel suffers from amnesia. She is actually μ-12, the predecessor of ν-13 and also the Final Boss in Console Version of Continuum Shift. Both are replicas of Saya, sharing her face, voice, and memories, though no answer is ever given to how they came to this end. It isnt far fetched to think the creators of both needed the original to accurately copy those traits from.
She was being immersed in the Boundary in the opening of story mode, though after the attack that destroyed Ikaruga she remains the sole survivor in that area. She eventually becomes the "eye", the true possessor of the Azure Grimoire.In Continuum Shift, she begins staying with Ragna, who starts caring for her much like he did with Saya.