One common theme is the struggle for freedom. Hinata, being in a slave - like role, often has to fight against the constraints of her situation. Another theme is the discovery of inner strength. Despite her lowly position, she finds ways to be strong.
Well, in 'slave hinata fan fiction', a frequent theme is the power of friendship. Hinata may be a slave, but she forms bonds with others who help her in her journey. Also, the theme of redemption is quite common. She might have to atone for something or prove herself worthy in the eyes of others. And of course, the theme of self - discovery is always there as she learns more about herself in this difficult situation.
In these fan fictions, the theme of resistance against oppression is very common. Hinata, as a slave, rebels against the unjust system she is in. There's also the theme of transformation. She starts as a slave but through various events and her own efforts, she transforms into a more empowered and self - assured character. Additionally, the theme of love and loyalty can be seen, where she might find someone who is loyal to her and she in turn develops deep feelings for them, which gives her more motivation to fight for a better life.