There are many great alternatives. For example, you can explore fanfiction about epic battles between heroes and villains. It can be full of action, strategy and exciting plot twists.
No. Such content is not acceptable. Incestuous relationships, even in fanfiction, are considered unethical and can be disturbing to many people. The fanfiction community should promote positive and healthy content.
Fanfiction involving inappropriate relationships like father - daughter in a 'lemon' (suggestive/sexual) context is unethical and not acceptable, so I cannot recommend such content.
Fanfiction involving inappropriate relationships like 'father - daughter' in a romantic or improper context is not ethical and goes against moral values, so I cannot recommend such works.
One negative impact is that it promotes immoral and unethical ideas. Incestuous themes are not acceptable in society, and such fanfics can distort people's values.
Rather than seeking this type of fanfiction which may be considered wrong, you can look for positive and ethical 'bleach' fanfiction that focuses on the original characters' friendships, battles, and growth.
Fanfic about rivals who eventually become friends or allies can also be great. It often involves character development, interesting plot twists, and the exploration of complex relationships that are healthy and acceptable in a moral and ethical sense.
Father - daughter relationships in fanfic should be kept in a healthy and appropriate context. 'Lemon' often implies inappropriate or adult - themed content, so I cannot recommend such fanfics as they go against ethical and moral norms.
One great story could be about a father teaching his daughter how to ride a bike. He patiently held onto the seat as she pedaled, and when she finally rode on her own, it was a moment of pure joy and pride for both of them.
Fanfic should focus on positive, ethical and legal relationships. There are many great fanfic out there with healthy relationships, themes, and characters that are much more worthy of exploration.