Perhaps she has a special power related to her blue eyes. For example, she can see things that others can't, like hidden treasures or the true nature of people. And the story could revolve around how she uses this power in different situations, whether for good or bad, and how she learns to control it.
A likely plot is that the girl with blue eyes falls in love with a boy from a different social class. Her blue eyes are what first attract him. But they face many obstacles in their relationship, such as the disapproval of their families. The story could be about how they fight for their love and whether they can overcome all the difficulties in the end.
One possible plot is that the boy's blue eyes are a sign of a prophecy. He is destined to save his village from a great danger, like an approaching dark force. His eyes might give him the ability to see the true form of this evil and find a way to defeat it.
One possible theme could be mystery. The ghostly blue eyes are likely to be a source of intrigue and an unknown element in the story.
The story of the girl with blue eyes could be a heart - warming tale. Maybe she was an orphan with those beautiful blue eyes. She was taken in by a kind old couple. Her blue eyes were like a window to her pure and kind soul. As she grew up, she used her kindness and the charm of her blue eyes to make friends with everyone in the village. She dedicated her life to helping others, and her story became an inspiration for the whole village.
One famous story could be 'The Little Match Girl' by Hans Christian Andersen. Although not specifically emphasizing her blue eyes much, we can imagine the poor little girl with blue eyes. She was out in the cold on New Year's Eve, trying to sell matches. As she struck each match, she saw beautiful visions, from a warm stove to a delicious feast. Eventually, she froze to death and was taken to heaven by her late grandmother. It's a tragic yet well - known story that shows the harshness of poverty.
One possible plot is that the girl was murdered and her ghost seeks revenge. She might haunt the killer or the place where she was killed.
Another theme might be mystery. The green eyes could be a symbol of something unknown, like a hidden power or a secret heritage. So the story could be about uncovering that mystery.
Maybe the fanfic has a plot where Madara's eyes are actually sentient in a way. They start to communicate with a young and inexperienced ninja. The eyes guide the ninja to become stronger and more powerful, but also lead them down a path that might not be entirely ethical. The ninja then has to decide whether to continue following the eyes' guidance or break free from it.
I'm not sure who the author of 'the girl with blue eyes novel' is. There are many novels with this kind of title, so more context might be needed to determine the author.
One possible plot could be that Kaa is a powerful villain trying to harm the girl, and the girl has to fight back to protect herself and her loved ones. Maybe Kaa has some special abilities like shape - shifting or mind control, and the girl uses her courage and intelligence to outwit him.
One possible plot is that the little girl is lost in a forest. But she bravely uses her knowledge of nature to find her way out. She might look for a stream and follow it downstream until she reaches safety.