One possible plot is that Naruto, as the reincarnation of Alucard, has a new form that he can transform into. This form has Alucard's appearance and some of his signature weapons, like the Casull handgun. His friends in Konoha are initially scared of this new form, but Naruto has to convince them that he's still the same person. He then uses this form to fight against enemies who are immune to normal ninja techniques, but are vulnerable to Alucard - like powers.
In this fanfiction, perhaps Naruto is the reincarnation of Alucard due to some ancient prophecy. His journey would then be about discovering his connection to Alucard. He could start having strange dreams about Alucard's past life and battles. As he uncovers more, he realizes he has to use Alucard's powers to save the ninja world from a new, powerful threat that only his combined Naruto and Alucard abilities can defeat.
The plot could involve Naruto having Alucard's powers and abilities, like his vampiric strength and regeneration. Maybe he uses these new powers to protect Konoha from a new kind of threat that normal ninja skills can't handle.
The 'Naruto neglected Alucard' fanfiction could have a plot where Alucard is brought into the Naruto world by some mysterious force. However, the shinobi community is so focused on their own affairs like ninja wars, clan politics, and training that they simply overlook him. Alucard, feeling slighted, decides to use his vampiric powers and centuries - old knowledge to carve out his own place. He might first target the outcasts or those on the fringes of society, and as his influence grows, he starts to draw the attention of the more powerful Naruto characters, leading to a complex web of relationships and power struggles.
Well, it could be about Naruto having some of Alucard's powers. Maybe he has enhanced strength and speed like Alucard. And he could use these powers to protect Konoha in a new and unique way.
One possible plot could be that Naruto, during one of his travels, stumbles upon the world where Alucard exists. Alucard, being intrigued by Naruto's unique chakra, decides to test him. Naruto, on the other hand, sees Alucard as a powerful and somewhat mysterious figure. They could end up teaming up against a common enemy that threatens both their worlds, combining Naruto's ninja skills and Alucard's vampiric powers.
Maybe there's a situation where a powerful artifact is being sought after. This artifact has the potential to cause chaos in both their worlds. Naruto and Alucard cross paths while both are on the hunt for it. At first, they compete for it, but then realize that they need to work together. Along the way, Naruto might try to get Alucard to see the value of friendship, and Alucard could show Naruto some of the secrets of the supernatural world that he doesn't know.
Maybe in the fanfiction, Fem Alucard is a rogue vampire in her own world and is on the run. She accidentally enters the Naruto universe. Naruto discovers her and initially mistakes her for a new kind of enemy. However, as he observes her, he realizes she is not all bad. Fem Alucard, in turn, is intrigued by Naruto's determination. They end up forming an alliance when a powerful foe from the Naruto world decides to use Fem Alucard's powers for their own evil purposes.
One possible plot could be that Naruto discovers Alucard in a strange world. Naruto, with his ninja values, tries to teach Alucard about honor and self - control. He might use his shadow clone jutsu to train Alucard in combat. And as a father figure, Naruto could also show Alucard the importance of friendship and loyalty.
One possible plot could be that a powerful villain tries to create a new Buu - like being using Naruto's chakra. But instead of creating a new Buu, Naruto is reincarnated as a hybrid of himself and Buu. This would lead to a lot of internal struggle for Naruto. He would have to deal with Buu's instincts while still trying to protect his village and friends. His friends might be initially scared of him, but over time they come to understand and accept this new Naruto.
The fanfiction could have a plot where Obito's reincarnation is not a normal one. He is reincarnated with a special mission from the afterlife. He has to find a way to bring peace to the shinobi world in a different way than Naruto did. He might have to face new enemies and also deal with the old grudges that still exist among the ninja clans. His reincarnation could also bring about a change in the relationship between the different villages as he tries to use his past experiences to create a more united and peaceful ninja world.
Maybe Naruto would have some of Ichigo's powers. For example, he could have a zanpakuto instead of a kunai.