Perhaps he has an encounter with an ancient ice - related artifact. When he touches this artifact, it unlocks something within him. It might be an old magic that was dormant in his bloodline all along. As he starts to explore this new power, he realizes that he can control ice, and he then has to learn how to use it properly without causing chaos.
In some fanfictions, Percy might discover his ice - controlling ability during a life - threatening situation. For example, he could be in a battle against a powerful fire - using enemy, and in a moment of desperation, he unknowingly taps into the power to control ice to counter the heat.
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.
If Percy is an editor or moderator, he could exercise control by setting rules for ice fanfiction. For example, he could say that all ice - based magic has to follow a certain set of guidelines. He can also accept or reject submissions based on how well they incorporate ice elements according to his standards.
Well, in some fanfictions, Percy might control ice through a new power bestowed upon him by some mysterious god or entity. Maybe he discovers he has the ability during a quest when he's in a really cold and magical place.
The environment could also pose a challenge. If he's in a really hot place, using his ice - controlling ability might be much more difficult as the heat could quickly melt the ice he creates. Also, if he's in a place with very little water vapor in the air, it would be hard to form ice in the first place, which limits his power usage.
It might also imply that Percy, outside of the fanfiction as a creator or a moderator, has control over the ice fanfiction. He could decide which stories get published, what kind of ice - related concepts are acceptable in the fanfiction community he oversees. This would give him a lot of power in shaping the ice fanfiction genre within that particular context.
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.
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.
In some fanfictions, it could be during a moment of extreme danger or intense emotion. For example, he might be facing a powerful dark wizard and in a desperate attempt to defend himself, he unknowingly channels lightning. It could also be through some kind of ancient magic that he stumbles upon, perhaps while exploring a hidden part of Hogwarts. Another possibility is that it is a latent ability that is awakened by a powerful magical artifact that he comes into contact with.
Well, perhaps he first notices it during a really intense storm at Hogwarts. Maybe he's out in the courtyard and suddenly the wind starts to change direction as he gets a strange feeling inside. It could be that he was in a Quidditch match and the clouds above started to move in an odd way when he was concentrating hard on winning.