Perhaps it leads to a confrontation between Harry and the fans, or it could inspire a change in the way the fans view Harry or Voldemort. Maybe it even sets off a chain of events that affects the entire magical world in the fanfiction.
It could lead to all sorts of chaos! Maybe Voldemort is furious and retaliates immediately.
Voldemort might initially be furious. He's not used to being challenged in such a blatant way. He could try to destroy the Howler immediately in a fit of rage.
The Howler might contain Harry's anger and defiance. He could be yelling about all the harm Voldemort has caused, like the deaths of his parents and many others. It could also include threats of how Harry will stop him once and for all.
It could lead to all sorts of chaos! Maybe Voldemort gets really angry and lashes out.
Well, it could be that Harry sends a Howler to the Ministry of Magic. He might be frustrated with their inaction or wrong decisions regarding the safety of Hogwarts. The Howler could expose some of their secrets or simply be a very public outburst of Harry's dissatisfaction, leading to a big political mess within the wizarding world.
Maybe Harry was really angry and wanted to shock Voldemort. A howler is a bold way to show that anger!
In such fanfictions, it often leads to intense emotional moments and revelations. Harry might be shocked or confused initially.
Well, if Harry got a howler from Voldemort, it might be filled with dark magic and menacing words to unnerve Harry. It could also be a ploy to throw him off his guard and disrupt his focus on fighting evil.
Well, it could lead to all sorts of drama and revelations. Maybe it's a scolding for something he did or a message of love and concern.
Harry might be initially shocked and embarrassed. A Howler is a very public form of scolding, and in front of all his friends and classmates, it would be a humiliating experience for him.