Well, it could be the unique atmosphere it creates. In the 'best jumpscare amnesia custom story', the setting is often dark and mysterious. The unknown elements lurking in the shadows add to the sense of dread. Plus, the sound effects play a huge role. The eerie noises that build up tension before a jumpscare are really effective in making it terrifying.
One idea could be exploring the backstory of the mansion itself. Maybe it was once a normal house before the spooky events started. Another could be focusing on a particular character's experience inside the mansion, like how they deal with the constant jumpscares. And a third idea might be to create a story where the characters find a way to break the curse of the mansion.
A brave and curious journalist could be a main character. They are always looking for a big story and think the mansion is their ticket to fame. Another could be a paranormal investigator who has been studying spooky places for years. And a young, adventurous kid who got lost and ended up at the mansion by accident.
Well, Vegeta would be a likely character. He might be initially suspicious of the female Goku. Maybe he thinks she's a threat or just can't believe there's another Goku - like being. He could be there to add some comical moments as he tries to understand the situation.
In general, it's a bit of a toss-up. The strength of Manga Goku and Anime Goku can vary depending on the specific arcs and battles. Sometimes, it might seem like one is stronger in a particular situation, but that could change in another.
Another possible main character could be the villain that forces the two Gokus to meet. This villain could be a new, super - powerful threat that the two Gokus need to deal with. Their meeting becomes a crucial part of the story to defeat this powerful foe.