Dragon Ball Z is both anime and manga. The anime was adapted from the manga and they share the same story and characters, but presented in different mediums.
A fanfiction might explore Good Broly's relationship with the other Saiyans on Earth. Maybe he starts training with the younger Saiyans like Gohan and Trunks. He could teach them about the raw power of the Saiyans from his own experiences. This would lead to some interesting training sessions and a new bond forming between Broly and the rest of the Z - fighters.
Many Dragon Ball Z Cell fanfics might explore alternate timelines. For example, what if Cell had successfully absorbed all the Androids before facing Goku? This would have made him even more powerful and could have led to a completely different outcome for the Dragon Ball Z universe. It's exciting to think about all these different possibilities.
In general, it depends on your perspective. Some might find it inappropriate as it can be a rather odd and perhaps not in - keeping with the traditional values of the Dragon Ball Z series. However, in the world of fanfiction, there is a wide range of tastes, and as long as it doesn't cross into truly offensive or unethical territory, some may consider it a creative, if strange, exploration of the characters.
Towa can play a significant role in fanfiction. She might be a central villain, driving the plot forward with her evil schemes. For instance, she could be planning to disrupt the time - space continuum in a fan - created story.
In fanfiction, Towa in Dragon Ball Z often has various interpretations. She is a complex character. Some fanfictions might explore her backstory more deeply, like her relationship with other villains in the Dragon Ball Z universe. Her powers and motives can be further elaborated in these stories.
Sorry to disappoint you. The Dragon Ball Z manga is not ongoing. It had its own definitive ending, but its popularity continues through various forms of media and merchandise.