In some fanfictions, it could be through a moment of extreme danger or intense emotion. For example, he might be in a situation where his friends are in peril from a fire - based threat. His strong desire to protect them could trigger this hidden ability. It's like a latent power that surfaces when his will is at its strongest.
On the positive side, he can use it to protect Hogwarts. He could be like a living, breathing firewall against any fire - related attacks on the school. For instance, if the Dark Lord tries to set the castle ablaze, Harry can use his fire - controlling ability to counteract the flames and keep the students safe.
In this type of fanfiction, Bella might be in a world where different elemental powers are at war. Her fire - controlling ability is crucial in the fight against those who control water or ice. She has to find a way to combine her power with others who have different abilities to defeat a common enemy.
Bella's ability to control fire could be part of a coming - of - age story in fanfiction. She initially struggles with her power, afraid that she might hurt those she loves. As the story progresses, she meets a mentor who helps her understand and master her fire - controlling skills. This newfound confidence allows her to stand up to bullies in her school and also helps her in other aspects of her life, like making new friends who are drawn to her unique ability.
Well, in such a fanfiction, he might control space through his magic wand. Maybe he uses a special spell that he discovers or invents, which allows him to manipulate the fabric of space, like creating portals or warping distances.
One consequence could be that the wizarding world starts to view him with even more suspicion and fear. People are already afraid of dementors, and if Harry can control them, they might think he's becoming too powerful or even turning to the dark side.
It could also be due to his own inner strength and growth as a wizard. Harry has faced so many challenges and traumas throughout his life. His experiences might have awakened a latent power within him that allows him to control dementors. His strong willpower and determination, which have been developed over years of fighting against the dark forces, could be the key factor in this newfound ability.
It could be through some kind of inheritance. Perhaps he has some long - lost family connection that gives him this unique power. In the fanfiction, he might start noticing strange things happening around cold or icy elements, and then gradually realize that he can actually control them.
In some versions of the fanfiction, it could be due to his unique heritage. Since Harry has a complex family background in the wizarding world, there might be some long - forgotten blood magic in his lineage that surfaces unexpectedly. One day, during a duel where he gets a minor cut and his own blood is exposed, he notices that he can somehow manipulate the flow of blood, and that's how he discovers this ability.
Perhaps it is related to some old magic that he inherits. One day, when he is exploring an old, abandoned place like an ancient wizard's tower. There, he touches an old relic which activates this hidden ability. As soon as he touches it, he feels a strange connection with the shadows around him and realizes he can control them.