Well, usually when we hear 'John Doe', it's more of a fictional or anonymous reference. But there might be rare cases where it refers to an actual person if it's in a very specific and local context that we don't know about.
Well, I'm not sure which specific 'John Doe vigilante' you're referring to. There could be many fictional or real - life cases with that name. Generally, a vigilante named John Doe might be someone who takes the law into his own hands. Maybe he's frustrated with the slow - moving justice system and decides to fight crime on his own. But without more context, it's hard to tell the full story.
One interesting John Doe fanfiction could be about his adventures in a fantasy world. Maybe he discovers he has magical powers and has to save that world from an evil sorcerer.
I'm not sure specifically what the 'John Doe Sad Roblox Story' is. It could be about a player named John Doe who had a bad experience in Roblox. Maybe he lost all his in - game items, or was bullied by other players in the Roblox world.
The 'John Doe Time Traveller Story' might be about John Doe accidentally stumbling upon a time - travelling device. He could start his journey through time, perhaps first going back to the time of dinosaurs. He might witness their daily lives, how they hunted and survived. Then, he could jump forward in time to a utopian future where all diseases are cured and people live in harmony. However, during his travels, he might also face some challenges like getting stuck in a time loop or changing something in the past that has unforeseen consequences in the present.
You can try fanfiction websites like Archive of Our Own (AO3). It has a large collection of fanfictions across various genres, and there's a good chance you'll find some great John Doe fanfiction there.
One key element could be the time - travelling mechanism. It might be a special device or a scientific discovery that enables John Doe to travel through time.