It might also indicate a newfound curiosity. Fanfiction often takes characters in different directions. Harry could be squinting at Malfoy because he's starting to see a different side of him. Maybe he's noticed something that makes him think Malfoy isn't all bad, and the squint is his way of trying to understand this new Malfoy better.
In some fanfiction, it could be a sign of attraction in a really interesting way. It's not the typical way of showing it, but the squint could be Harry's way of looking at Malfoy when he's feeling some sort of strange pull towards him. This would be a really different take on their relationship, but fanfiction allows for such creative interpretations.
It could be a sign of distrust. Harry has always been suspicious of Malfoy's actions and motives, so the squinting might be his way of trying to figure out what Malfoy is up to.
It could be that Harry has noticed some strange behavior from Malfoy. For instance, Malfoy might be acting secretively around certain areas of Hogwarts. Harry's squinting is his way of observing Malfoy closely to find out what he's hiding.
Another theme is rivalry - turned - friendship. The act of Harry squinting at Malfoy can be seen as a precursor to a change in their relationship. As the story unfolds, they might start to understand each other better and form an unexpected bond. For example, in some fanfictions, they team up against a common enemy after Harry realizes that Malfoy isn't as bad as he initially thought. This is often a very heartwarming theme.
The squinting could symbolize his uncertainty. He might be in a new and unfamiliar place, and squinting shows that he's not entirely sure what to expect. For example, if it's a room in a wizarding inn he's never been to before, the squinting is his body's natural reaction to the unknown environment.
There's also 'Squinting at the Rival' which delves into how Harry's constant squinting at Malfoy might be a sign of his underlying curiosity about Malfoy's true motives and actions. This fanfic has some great character development and a really interesting plot that keeps you hooked.
One interesting fanfiction could be 'The Unspoken Glances' where Harry's squinting at Malfoy is a sign of his growing suspicion about Malfoy's secret activities. It delves into their complex relationship and how their interactions change over time.
In many fanfictions, Harry Potter squinting at Voldemort could be a sign of intense focus. It might be that Harry is trying to read Voldemort's next move, or perhaps he's looking for some sign of weakness. For example, in some stories, Harry's squinting could be related to his newfound magical abilities that he's using to analyze Voldemort's magic signature.
One possibility is that Harry's squinting eventually leads to a confrontation. He might directly question Malfoy about his actions, which could either end in a fight or a reluctant alliance if they find out they have a common enemy.
One possible fanfiction could be that Harry Potter is kidnapped by a dark wizard who has some strange power that makes Harry squint. Maybe this wizard is trying to use Harry's unique connection to Voldemort for some dark ritual. Harry has to use his wits and the few spells he can manage while squinting to try and escape.
In the fanfiction, Harry squinting at Wormtail might also be a moment of intense focus. Harry could be trying to use his Legilimency skills (if he has developed them in the fanfic world) to read Wormtail's mind. He's squinting as he concentrates, trying to break through any mental defenses Wormtail might have. It could be a crucial moment in the story where Harry's discovery of Wormtail's thoughts could change the course of events.