Admittedly of the three mentioned she is the one I mind the least. She has a great character development arc and it doesn't take long before she turns into a credible anti-hero.
Actually all of them have good characters.
Cue Ball is crazy, but he is also credible in the way he really want to be a hero for justice, but has the IQ of a slug and is motivated by the wrong reasons. And Pillsbury Dough Woman is a tragic figure that is so focused on helping others that her good heart is used against her. It should have been really sad when she died.
Unfortunately their character designs ruins the dramatic effect of the writing. You simply can't take something that looks like that seriously. At least I can't.
She is the main protagonist after all.
That's one of the cool things Mirai Nikki does - it deceives us into believing that it's a story about a boy named Yukki who is suddenly pulled into a battle royale and is saved by a side character named Yuno.
But in reality it's all Yuno's story. She created everything, including Yukki and Deus. And it all started with her mom slipping into a deep depression and her dad being unable to cope with her mental disease and distancing himself... maybe in shame, since Japan is all about keeping face and hiding bad stuff. And this in turn this initiated the circle of tragedy that is Yuno's background.
This part was really well done, and it was written before time-resets became fashionable.
The reveal also works very efficiently the first time you watch it.
Most anime have archetypes from NGE. Anno practically invented them.