One possible scenario is that Anakin might get inspired by the unique battles and combat strategies depicted in the fanfiction. He could start thinking about how he would handle those situations in his own way, given his skills as a Jedi and later as Darth Vader.
Perhaps Anakin would find the fanfiction to be an interesting diversion from his own experiences. He might see characters in the Death Battle fanfiction with powers similar to his own and compare their uses of power. For example, if there were a character with a lightsaber - like weapon, he'd analyze how they fought compared to his Jedi training. He could also be intrigued by new and strange powers that don't exist in his world.
His perspective could become more open - minded. He'd see different interpretations of battles and characters, which might make him question his own assumptions about combat and relationships in his own universe.
Anakin's journey from Jedi to Sith and back again gives him a complex perspective. Other viewers might just see the battles as entertainment, but Anakin would likely see them through the lens of his own struggles with power, loyalty, and redemption. So, when watching the fanfiction, he could be constantly comparing the battles and characters to his own past actions and relationships, which is very different from the average viewer's more detached perspective.
Yes, it is quite popular. There are a number of fans who like to combine the two concepts. They love to see how the heroes and villains of Overwatch would fare in the intense battles characteristic of Death Battle. There are various online platforms where such fanfiction is shared and discussed, which shows that there is a significant audience for it.
Typically, it might feature the characters from strq observing the intense battles in Death Battle. There could be a lot of reaction elements, like shock, excitement or analysis from the strq characters.
Yes, it likely exists. There are fanfiction for all sorts of combinations in the world of fandoms. Since both Spiderman and Death Battle are popular topics, it's very possible that someone has written fanfiction that combines the two, and Spiderman could be depicted as reading or being involved with such fanfiction within that fictional story.
There are often fanfictions that involve crossovers in 'watches death battle' scenarios. Imagine a battle between a superhero from the DC universe and a powerful anime character. These crossovers can lead to really exciting and unexpected plot twists as the different power systems interact.
Maybe Spiderman gets some new combat ideas. He could see some unique fighting styles in the Death Battle fanfiction and incorporate them into his own superhero battles.
Obviously, Sonic himself is extremely popular. He's the main character, after all. Tails also often makes an appearance as Sonic's sidekick. Knuckles is another popular one, with his strength and connection to the Chaos Emeralds. And then there are the villains like Dr. Eggman who are frequently part of the death battle scenarios in these fanfictions.