There are fanfictions where the Si Oc is a Saiyan from a different planet than Vegeta and Goku. This Oc might have been sent away as a baby just like Goku but ended up on a completely different world. When they return to the Dragon Ball Z universe, they have a different fighting style and set of values. They could form alliances with the Z - fighters in a very different way, perhaps being more cautious or more aggressive, depending on their experiences on the other planet.
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.
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.
Dragon Ball Z is not based on real events. It's a creation of the author's imagination, presenting a unique and exciting fictional universe filled with characters and adventures that exist only in the realm of fiction.