One possible reason Draco might be depicted as speaking Parseltongue in fanfiction is to add an element of mystery and danger to his character. In the original 'Harry Potter' series, Parseltongue was associated with dark magic and Slytherin heritage, which Draco already has. This could be a way for fanfiction writers to explore his character's darker side more deeply.
One interesting fanfic could be 'The Hidden Power of Parseltongue' where Harry discovers new abilities with his Parseltongue. Another might be 'Parseltongue in the Forbidden Forest' which has Harry using his skill to communicate with hidden creatures there. And 'Parseltongue and the Ancient Prophecy' could be a great one where his Parseltongue is linked to an ancient prophecy.
One possible plot could be that Draco uses his French skills to charm a French exchange student at Hogwarts. He might show off his knowledge of the language, French cuisine, and culture to impress the student.
One adventure could be that he is led by a magical snake to an ancient tomb. Inside the tomb are puzzles and traps that can only be solved by using Parseltongue. He has to rely on his instinct and the little knowledge he has of the snake language to progress. As he moves forward, he discovers that the tomb holds the key to a powerful magic that could either save the wizarding world from a new threat or, if misused, destroy it. Harry then has to decide whether to keep this discovery to himself or share it with his friends and mentors, all while still struggling with his limited means of communication.
With Hermione, she would probably be very interested in researching more about Parseltongue and how it works in Harry. She might try to find ways to help Harry control it better or understand its full potential. This could strengthen their bond as they work together on this unique aspect of Harry's magic.
Well, I'm not sure of a specific 'Draco speaks French' fanfiction off the top of my head. However, you can look through different fanfiction communities dedicated to the Harry Potter fandom. Some stories might have Draco speaking French as part of a plot where he's showing off his cultured side, or perhaps he's using it to communicate secretly with someone.
It can introduce new conflicts. If Draco's Parseltongue ability is discovered, it could lead to suspicion from other characters, especially those who are wary of anything related to dark magic. This could create a rift between Draco and his friends or family within the fanfiction world.
It would likely make others more fearful and distrustful of him. Since Parseltongue is associated with Dark Magic in the wizarding world, even those who know Harry well might be a bit on edge. For example, Ron, who already has some insecurities, might become more distant at first, fearing that Harry is being influenced by dark forces.
One idea could be that Draco's ability to speak Parseltongue gets him into trouble with the Ministry of Magic which is still very much on edge after Voldemort's fall. They suspect him of dark intentions. Another could be that he uses it to secretly communicate with a hidden basilisk in Hogwarts, left behind from the Chamber of Secrets era. And he might be trying to protect it or use it for some sort of personal gain in the wizarding hierarchy.
Well, at first, Harry would probably be very wary of Draco. Since he has his own history with Voldemort and Parseltongue, he'd see Draco's new ability as a sign of potential danger. However, as time goes on, if Draco is trying to use his Parseltongue for good, like communicating with snakes to find out about dark magic threats, Harry might start to trust him more. Their relationship could shift from one of enmity to an uneasy alliance. They could even start to understand each other's insecurities better. Harry has always been an outcast in some ways, and now Draco is too with his strange new ability.