In some fanfictions, they might show Harry having dark powers through things like unexpected magical outbursts with a malevolent tinge. For example, he could accidentally use a spell that causes harm in a way that seems to draw on darker magic. However, in the original series, Harry is firmly on the side of light magic, so this is a departure in fanfiction.
Yes, in certain 'Harry Potter has dark powers fanfiction'. There are often scenarios where the author decides to explore a different path for Harry. Maybe they make his experiences with the Dementors or his scar lead to him developing dark powers. He might start using spells that are more associated with the Dark Arts, like the Unforgivable Curses in a different context. This is all part of the creative freedom in fanfiction, which can be quite different from the canonical story.
Often, in these fanfictions, the discovery of a new, ancient and dark magic artifact can be a plot device. Harry might find this artifact and, as he tries to understand or control it, he starts to develop dark powers. Also, the idea of a prophecy misinterpreted can play a role. A prophecy that was thought to be about his heroism is actually about his fall to the dark side, leading him to explore and use dark powers.
Yes, there are. You can find them on popular fanfiction websites like FanFiction.net or Archive of Our Own. Just search for 'Harry Potter has fire powers' in the search bar, and you'll be presented with a list of relevant stories.
The powers might also change the way magic is perceived in the story. If Harry can do things like read minds or foresee events, it could make other forms of magic seem less powerful in comparison. Or it could inspire other characters to explore different, more psychic - related magic, thus expanding the magical lore in the fanfiction.
Harry might gain the ability to dodge attacks more easily. Sans has a certain 'instinct' for avoiding harm, and if Harry had this, it would be much harder for his enemies to land a hit on him. This would be really useful in duels, especially against powerful dark wizards. It could also make his Quidditch playing even more amazing as he could dodge bludgers effortlessly.
Yes, there are many. In some fanfictions, the sword might have the power to cut through any dark magic. For example, it could be able to destroy Horcruxes more easily than in the original story. It might also have the ability to protect the wielder from the most powerful curses.
He might face acceptance issues. The wizarding community may not understand or may be afraid of his new Devilman powers. They could see him as an outcast or a threat, which would make it difficult for Harry to fit in as he did before.
He might discover them accidentally. For example, in a moment of extreme danger or high emotion. Maybe he's being attacked by some dark creatures and suddenly feels an unknown power surging within him, which turns out to be the Devilman powers.
Harry's magic is mainly based on incantations and the use of a wand. Sakura's magic, especially as Dark Sakura, is more instinctual and connected to her very being. Their powers could interact in a way that Harry's spells could act as a sort of catalyst for Sakura's power. For example, if Harry casts a spell of protection around them, it could enhance Sakura's ability to focus her dark magic without it going out of control.
Well, if Harry Potter had sans powers, he might be able to teleport around Hogwarts easily. This would make it much simpler for him to avoid danger or get to his classes on time. For example, when facing Voldemort, he could suddenly disappear and reappear behind him to gain an advantage in battle.
In such a fanfiction, Harry having Elsa's powers would completely change the dynamics of the wizarding world. Imagine Harry using his ice powers during the Triwizard Tournament. He could freeze the lake instantly in the second task, making it easier to retrieve what he needed. Also, he could create ice sculptures of magical creatures during the Yule Ball, adding a unique touch to the event. His relationship with his friends might also change as they'd be in awe of this new power.