In most cases, it is legal to watch fanfiction. Fanfiction is generally considered a form of derivative work based on existing intellectual properties. As long as it's not being sold without permission or used in a way that violates copyright in a major way, just reading or watching it for personal enjoyment is usually okay.
Fanfiction.net could also be a place to check. It has been around for a long time and hosts a vast amount of fan - made stories. However, the interface might not be as modern as some other sites. But still, it's worth a shot to search for your desired Dante vs Bayonetta fanfiction.
Real life Dante and the fictional one can differ greatly. Fictional Dante is often created with imaginative elements and specific storylines, while real life people don't have such fictional attributes.
In many cases, the fictional Dante is given extraordinary traits and adventures that might not exist in the real person's life. The real Dante likely had a more mundane and typical existence compared to the fantastical portrayals in fiction.
The main difference is that fictional Dante is created within an imaginative world with fictional elements. Real life Dante doesn't have those fictional aspects and is shaped by real-world factors and experiences.
The fictional Dante is often idealized and may have supernatural abilities or exaggerated characteristics that don't exist in real life. Real-life Dante was just an ordinary person with normal human traits and limitations.
The main difference is that the fictional Dante can be shaped to fit various storylines and themes. Real-life Dante would have lived a more ordinary and historically accurate life without the fictional elements added for entertainment.