Well, in such a fanfic, perhaps it might explore Naruto's struggle with the stigma of being an outcast in a different way. It could show how he overcomes the cruel rumors and discrimination.
In the original story, Naruto is an orphan but not stigmatized as a 'bastard child'. So this fanfic clearly changes the social perception of Naruto in the village. In the original, his main struggle is about being alone and getting recognition as a ninja, while here it adds a whole new layer of social discrimination.
Well, it could be that someone who doesn't like Naruto has written a fanfic with a really negative and offensive view, calling Naruto a 'bastard'. However, this goes against the spirit of the original work which is about friendship, growth, and perseverance. Most Naruto fans would probably be outraged by such a description in a fanfic.
Using the term 'bastard' in this context is inappropriate and disrespectful. 'Kushina' is Naruto's mother in the Naruto series. A 'fanfic' is a fan - created fictional work. But this title seems to convey a negative and unkind sentiment towards a character or a work related to Naruto.
It could be that they have a very different interpretation of Naruto's character. However, this is a very extreme and negative way of expressing that view. They might not understand or appreciate the values and growth that Naruto represents in the original story, and instead choose to write something so unkind.
I'm not sure if there is such a specific fanfic. There are a vast number of Naruto fanfics out there, but this description seems rather unorthodox and disrespectful to the original work. The Naruto series has a rich lore and many positive aspects that most fanfics tend to explore in more positive and creative ways, rather than using such derogatory terms.
In ancient times, the status of the children of concubines was very low. They were regarded as commoners, and their status was far inferior to that of legitimate children. The children of concubines could not call each other brothers and sisters with the children of legitimate children. They even had to take on the daily work of serving the legitimate brothers and sisters. They couldn't call their father 'father'. They could only call him' Lord 'or' Master'. The status of the children of concubines in the family was equivalent to that of slaves. They could not inherit the family business, nor could they take their lowly birth mother as their mother. Their fathers usually didn't pay much attention to them. Therefore, it could be said that the status of the children of concubines was very low.
The child could be an orphan from a small, destroyed village that Naruto comes across during one of his missions. This child might have lost their family to a powerful enemy and Naruto feels a sense of responsibility to take them in.
Reacting to this title, first, we should recognize that the use of the word 'bastard' is inappropriate. We can choose to ignore it if we don't want to engage with offensive content. However, if it's part of a community where respect and positive values are promoted, it could be a good idea to let the creator know that such a title is not acceptable. This could be a chance to educate about the importance of respectful language in relation to fictional works and their characters.