Who would be the most powerful character in a 'naruto alucard dxd fanfiction' and why?

In the DxD world, there are many powerful characters like Great Red or Ophis. However, in a 'naruto alucard dxd fanfiction', it really depends on how the author writes the story. If the author gives Naruto the ability to combine his powers with Alucard's vampiric essence and also learn some of the ultimate techniques from the DxD world, he could potentially be the most powerful. But if Alucard is written to be at his full power without any limitations, he could overpower everyone. It's all about the creative vision of the fanfiction writer.

It's hard to say for sure, but Alucard has the potential to be extremely powerful. His vampiric abilities like regeneration, immortality, and the ability to summon his army of familiars give him a huge edge. He can take a lot of damage and keep coming back. In a fight against Naruto's ninjutsu or the various powerful beings in the DxD world, he could be a force to be reckoned with.