Yui's Backstory versus The Oni's Backstory
I am pretty disappointed with Yui's story and I am pretty impressed with Oni's backstory. Here's why:
Yui as a character has no development or personality beyond the "strong independent woman" archetype and the idea of women's empowerment. Neither of these things are a bad thing to have as aspects of a character, but that is all she is. There's nothing more to her. She has no flaws, she has nothing about her personality that makes her human, and she seems to exist only as an idealized icon character. She goes through no internal hardships. The only things that ever prove to be negatives in her life seem to be external, and all various male stereotypes. Now before someone jumps down my throat calling me sexist, I will repeat myself. There is nothing wrong with women's empowerment or the "strong independent woman" archetype being a part of a protagonist. The issue is that Yui is a very shallow character. This is what's called a mary-sue in film making. A character who has no flaws and no development, and always comes out on top just because they are awesome.
Now on the opposite end of the spectrum is The Oni.
Kazan was raised in a veteran family who had served as samurai, who Kazan had grown to idolize while growing up. Kazan wanted more than anything to be one of those noble samurai like his father. As he grew up, he began to despise the changing times and the people who were now being accepted as samurai. He saw their flaws and less than perfect ways and set out on a morbid journey to cleanse the honor of the samurai by removing these people. He went on a long bloody path of murder. Eventually he earned a name for himself and was feared as an Oni (which is a Japanese demon that is similar to the Western ogre, but is smaller, much more intelligent, and evil.) Kazan eventually cut down anyone who stood in his away, along with his appointed victims. One day a samurai blocked Kazan's path and he killed him. This turned out to be his father. This was a tragic part of The Oni's story and displays just how far he had fallen from grace. Instead of blaming himself for this, Kazan blamed the feudal lord, and set out to kill him. He succeeded and was then killed by the farmers of the village who had loved their lord.
In this story, Kazan is depicted as a person who wants what is good, but has a deeply flawed personality due to his ever increasing standards for honor. At some points in the story, Kazan questions his actions, knowing somewhere inside of himself that what he's doing is wrong, but he is honor bound to complete his goal. He becomes more and more resentful of the people, as they grew more and more fearful of him. He has actual character development. He is a very different Kazan at the end of the story than he was at the beginning, but still has enough in common to draw a logical path to how he became that way.
This is good writing. Among the best writing in Dbd. Yui's story pales in comparison, since Yui lacks any of the qualities that make a compelling character. It sort of reminds me of Game of Thrones season 8. The plot points themselves could have been good, but the way we arrived at them are so contrived that we are left unable to really appreciate them. Her story had no development to speak of. Just bullet points on how she got from place to place, things happen, then she comes out on top because she's awesome, then things happen, then she comes out on top because she's awesome, eventually ending up in this race that was never mentioned before and getting pulled into the realm of the entity.
Now granted, she does have the best visual design out of any dlc characters in my opinion. Her pink ribbon is a good part of her model. It's just disappointing that she doesn't really have a personality.