The most interesting aspect is probably the new power - ups. Since he still has his tail, there could be new forms related to it. Maybe a combination of his normal Super Saiyan forms and his ape - like abilities. It's exciting to think about how this would look in battles.
I think the most interesting part is how it changes Goku's character. Without losing his tail, he may retain some of his more primal instincts. This could lead to him having a different personality, being a bit more wild and unpredictable. And this new side of Goku would surely bring some fresh and unexpected plot twists in the fanfiction.
One of the most fascinating things about this fanfiction is how it impacts the Saiyan lore. In the original story, the loss of the tail was a part of Saiyan evolution. But here, Goku not losing his tail means that the whole concept of Saiyan growth and development has to be re - evaluated. It could open up new backstories and explanations about the Saiyan race, their powers, and their place in the universe. This re - imagining of Saiyan lore could be really engaging for fans who are interested in the deeper aspects of the Dragon Ball universe.
If Goku never lost his tail, his powers and abilities might have developed differently. Maybe he would have retained some primal monkey-like traits that could have given him unique advantages or disadvantages in battles.
Well, if Goku didn't lose his memory, his relationships with his friends and family could have developed differently. Maybe he'd have fewer conflicts or approach problems with a clearer mind.
Perhaps in this fanfiction, Goku remembers all his past battles vividly. This could lead to him having unique strategies against old foes. For example, when facing Frieza again, he recalls every single move Frieza made during their previous encounters and is able to counter them with ease, making the fight much more one - sided in his favor.
Well, in the original story, Goku's loss of his tail was a significant event. But in this fanfiction, with him never losing his tail, it might mean he has different powers or abilities. Maybe he can still transform into a giant ape at will, which could change the way he battles. For example, in a fight against a powerful enemy, instead of using his normal Super Saiyan forms, he could use his ape form to overpower the foe in a more brute - force way.
Obviously, Goku is the central character. His unaltered memory shapes the story.
One possible plot could be that Goku's power development takes a completely different path. Without the head injury that altered his original Saiyan nature in the official story, he might be more in tune with his Saiyan instincts from the start. This could lead to him being more aggressive in his battles and perhaps having a different moral code when it comes to fighting. He may not have the same innocent and somewhat naive view of the world that he had in the original story, which was partly shaped by his head injury.
One interesting plot could be that Goku's tail gives him a new power. Since it's always been a unique part of him, perhaps it allows him to communicate with a certain race of creatures that are only attuned to the energy his tail emits. Another plot could be that he has to protect his tail from an enemy who wants to use it for some dark magic. The enemy believes that Goku's tail holds the key to unlocking a powerful spell, so Goku has to constantly be on guard while still going about his normal adventures.
One possible plot could be that Goku somehow gets transported to the Fairy Tail world. He could join forces with Natsu and the gang to fight against a common enemy like Acnologia. Goku's power levels would be off the charts compared to most in Fairy Tail, but he'd be intrigued by their magic. Maybe he'd learn some magic himself or teach them some of his ki techniques.
The most fascinating thing about 'harry is a dovahkiin fanfiction' could be the world - building. Merging the magical world of Harry Potter with the vast and detailed world of Skyrim where the Dovahkiin exists. There could be new places to explore, new creatures to encounter, and new ways to interact with magic. For example, how would Hogwarts look if it was in Skyrim? And how would the students and professors react to the presence of a Dovahkiin like Harry? This kind of crossover can lead to some really creative and exciting world - building opportunities.
The most interesting aspect could be the clash of power systems. Naruto has his chakra - based ninja skills, while Overlord has a more RPG - like power structure. Seeing how Naruto would adapt to and perhaps even disrupt the Overlord's power hierarchy would be really engaging.