Good 'Sakura Haruno Cardcaptor' fanfic usually stays true to the characters' personalities. For example, Sakura should remain her kind - hearted, brave self. It also often has an engaging plot, like a new mystery involving the cards. And the magic system should be somewhat consistent with the original.
Well, in a great 'Sakura Haruno Cardcaptor' fanfic, the relationships between the characters are well - developed. It might explore Sakura's relationship with Syaoran in more depth, or her bond with her friends. The setting should also be immersive, whether it's the familiar world of Tomoeda or a new magical realm. Additionally, a good fanfic will add something new to the story, like a new type of card or a different way of using the existing cards. It should also be well - written in terms of grammar and style so that readers can enjoy the story without getting distracted by errors.
A good 'Sakura Haruno Cardcaptor' fanfic often has a strong sense of adventure. Since the original series is full of Sakura's quests to capture cards, the fanfic should carry on that spirit. It might also have unique interpretations of the Clow Cards' powers. For instance, a fanfic could give a card a new power that is still in line with its original nature. Character growth is also important. Sakura should develop as a character, perhaps learning new skills or becoming more confident in her abilities. And the fanfic should be able to draw in readers with an interesting hook at the beginning, like a strange event that sets the story in motion.