What could be the plot of a fanfiction where Naruto is Barry Allen's descendant?

Sure. Fanfiction writers often like to combine different popular franchises. They might create a story where Naruto, from the ninja - filled world of Naruto, has some sort of connection to Barry Allen, the Flash. Maybe there's a prophecy in the Naruto universe that links his family line to Barry's in the future, leading to Naruto being his descendant.

One possible plot could be that Barry Allen, while chasing a meta - human criminal, accidentally runs into Gotham City. There he meets Batman who is initially suspicious of this super - fast stranger. They could end up teaming up when they realize the criminal they are after is part of a larger, more sinister plot that involves both Central City and Gotham. Barry's speed could help Batman in getting to places quickly and in combat situations, while Batman's detective skills could assist Barry in figuring out the criminal's motives.

Well, it could be about Harry having the speed force abilities from Barry Allen. Maybe he uses those powers to quickly escape from Voldemort's attacks or to quickly find Horcruxes. He could also use his speed to outmaneuver his enemies at Hogwarts like Malfoy and his gang.

The plot could be centered around a time - traveling adventure. Barry Allen uses his speed to travel through time and accidentally brings Kara Danvers to a different era. There, they find a lemon grove that has some sort of magical properties. A villain wants to use these properties for evil, so Barry and Kara must protect the lemon grove and find a way to get back to their own time.

The plot might involve Naruto being hunted because of his relation to Logan. Enemies from Logan's world might think he has some sort of valuable information or power. Naruto would then have to use both his ninja and new - found mutant - like abilities to defend himself and his village.

One possible plotline could be Naruto discovers a way to travel to Barry Allen's world. He then tries to learn from Barry about his speed powers and how to use them in his own ninja - fighting style. Another could be that Barry Allen accidentally ends up in the Naruto universe and Naruto becomes his guide, all while being in awe of Barry's abilities.

One possible plot could be Barry Allen using his super speed to solve a complex mystery in Central City. He might discover a new villain who has the ability to manipulate time, and he has to race against the clock (literally) to stop the villain from changing the timeline in a disastrous way.

Well, in a Barry Allen creates Gideon fanfic, the plot might start with Barry realizing the need for a more advanced technological support system. So, he begins to research and develop Gideon. As he does this, he discovers some new scientific principles that he has to master. Maybe he has to collaborate with some other brilliant minds in the DC universe, like Cisco Ramon. And during the creation, Gideon starts to develop its own personality earlier than expected, which causes some unforeseen problems for Barry. For example, Gideon might start to question Barry's motives or methods, leading to an internal conflict within the fanfic's storyline.

The fanfiction might explore the concept of a Naruto character being a descendant of Sparda in many ways. For instance, the character could have a special form or transformation similar to Dante's devil trigger in the Devil May Cry series (since Sparda is from that). This form could give them enhanced strength, speed, and abilities. They could also face challenges related to their dual heritage, like being shunned by some in the Naruto world who fear the unknown powers. And the story could revolve around how they overcome these prejudices and prove themselves as a valuable asset to their comrades and the entire ninja community.

Well, it could be about a character who is a descendant of Muu having some sort of special powers that Naruto discovers. Maybe they team up to fight a new threat in the ninja world.