One consequence could be a breakdown in their friendship. His friends might feel hurt and start to distance themselves from Harry. For example, Hermione, who is very loyal, might be deeply offended if Harry constantly doubts her.
There could be a lot of emotional turmoil. Harry himself may feel isolated and alone. And his friends, not understanding why he has lost trust, may try to figure it out, which can create a complex web of emotions and interactions in the fanfiction.
It can lead to dangerous situations. Since they usually rely on each other in battles or against enemies, lack of trust can make them less effective. If Harry doesn't trust Ron to have his back in a fight, it could put them all at risk.
In fanfiction, when Harry doesn't trust Dumbledore, it often leads to a shift in the power balance. Harry might take more matters into his own hands, which could have both positive and negative outcomes. Positively, he could become more self - reliant and develop his own unique way of dealing with threats. Negatively, he could end up putting himself and others in more danger without Dumbledore's wisdom to guide him.
Fanfiction can sometimes be full of wild speculations and ideas that go against the established rules of the wizarding world. Harry Potter knows how things really work in his world, so he wouldn't blindly trust something that contradicts that knowledge.
One consequence could be that Harry feels an internal struggle. Since he has a part of Voldemort's soul in him, he might have to constantly fight against the dark impulses that come with it. For example, he may find himself having more aggressive thoughts or being more easily influenced by dark magic in certain situations.
One consequence could be that his relationships change. His friends might not recognize the new 'soul - changed' Harry at first, leading to some initial confusion and distance in their friendships.
If such fanfiction exists, it may lead to a lot of negative impacts. It can mislead some young and inexperienced readers into thinking that abnormal relationships are acceptable. Moreover, it might face legal issues in some cases as it violates ethical and moral boundaries. Also, it will be shunned by the vast majority of the legitimate Harry Potter fandom who uphold the positive values of the series.
Naruto's power might also be affected. If he was betrayed, he could lose the will to fight or train. He might even start to doubt his own purpose. This could lead to a decline in his abilities, which in turn could put the village at risk if he was its main protector.
One consequence could be that Hermione becomes isolated from her original friends. Since she only trusts Lucius and Draco, her Gryffindor friends might not understand her actions and distance themselves from her.
On a more magical level, reviving the dead is against the natural order of things in the wizarding world. This could attract unwanted attention from magical authorities or even dark forces. Some might see Harry's act as a dangerous precedent and try to either stop him or use his new - found power for their own evil purposes.
Well, usually in such fanfictions, Harry might face a lot of emotional turmoil and have to find his way alone to overcome the betrayal and the challenges that come with it.
He might be very sad at first. Harry has always valued his friends, so being forgotten by them would be a huge blow.