overpowered from the start

I'd recommend 'Divine Might Chronicles'. Here, the main character is born with god-like abilities and dominates from the get-go. The plot mainly focuses on how they use these powers to face various challenges.

First, choose the game world you want to base it on. Then, decide on what makes your gamer character overpowered. It could be a unique skill, a powerful item, or some kind of cheat code. For example, if it's a 'Final Fantasy' - based fanfiction, the character could have a sword that can cut through any defense.

First, you need to be familiar with the original gamer fiction. Know the rules, the power - ups, and the characters. Then, decide on your own unique twist for the adaptation. It could be changing the gender of the main overpowered character or putting them in a different time period within the game's lore.

Maybe it has the ability to absorb chakra. So when Naruto is in a fight against an opponent with a large amount of chakra, he can use the sword to drain some of that chakra, weakening the enemy while strengthening himself. The sword could then store that chakra for later use, like to boost Naruto's own attacks.

It could be a sword that can cut through any substance, like the Susanoo easily. Just imagine Naruto swinging it and slicing through powerful jutsu defenses as if they were paper.

Well, it really depends on the specific fanfiction. Some fanfictions do make Ichigo overpowered. They might do this to explore different storylines or just for the fun of it. For example, in some, he could have a sudden boost in his reiatsu that makes him almost unbeatable. But not all fanfictions take this route. There are also those that focus on his character development in a more realistic way within the context of the Bleach universe and don't make him overly powerful.

First, avoid the typical 'chosen one' origin for the overpowered oc. Instead of being born with powers for some grand prophecy, give them a more unique backstory like an accidental scientific experiment gone wrong. For the 'lemon' part, don't just jump into it. Build up the relationship between the characters gradually. For example, start with some light flirting and shared interests before getting more intimate. And don't rely on overused power tropes like shooting lasers from the eyes or being super - strong without any drawbacks. Maybe give the oc a power that has a strange side - effect that they have to deal with.

Sure. 'Re:Monster' is a great one. The MC is reincarnated as a goblin and quickly becomes overpowered through his unique skills and the ability to evolve. Another is 'Arifureta: From Commonplace to World's Strongest'. The MC starts as a weakling but after a series of events, he becomes extremely powerful with a wide range of combat and survival skills.

We can probably expect a lot of action scenes given the 'overpowered' aspect. There might be battles where the main character easily defeats foes due to their excessive power.

Well, in some fanfictions, Naruto might obtain the overpowered sword through a mysterious inheritance. Maybe it was left by a powerful ninja from the past and Naruto discovers it in a hidden cave or something.