One possible plot could be that Harry Potter, while on one of his adventures, stumbles upon the world of the Dragon Maid. Maybe he's accidentally transported there. He then befriends the Dragon Maid characters. Tohru could teach Harry about her dragon culture, which is completely different from the wizarding world he knows. And Harry could introduce magic from his world to the Dragon Maid characters, like showing them how to use a wand or perform simple spells.
One possible plot could be that the maid is a magical being in disguise. She could be secretly helping Harry Potter with his tasks at Hogwarts, like cleaning up after his potion experiments in a much quicker and magical way than normal. Maybe she has some hidden knowledge about the Dark Arts that she imparts to Harry in a very subtle way, which helps him in his fight against Voldemort.
Well, in this fanfiction, the main character could be a new student at Hogwarts who has a special connection with dragons. They manage to bring a dragon egg to the school. Once the dragon hatches, they live with it in an abandoned part of the castle. The dragon helps the character in various ways, like finding hidden passages. But they constantly have to be on guard against Draco Malfoy and his cronies, who suspect something strange is going on and want to expose the character and the dragon.
Harry might be very curious about the dragon characters in 'Living with Dragon Maid'. He would probably ask a lot of questions about their abilities and their dragon forms. The dragon characters, like Tohru, would be equally interested in Harry's magic. They would likely want to see him perform spells. Harry could also be a bit cautious at first, as he's used to dealing with dangerous creatures in his world, but he'd soon realize that the Dragon Maid characters are friendly.
In the fanfiction, Harry might be cursed to transform into a dragon periodically. He then has to figure out how to control this new form. He could meet other magical creatures that are either scared of him or intrigued by his dragon form. He might also find that his dragon form gives him unique powers that he didn't have as a human wizard, like the ability to fly faster or breathe a more powerful type of fire.
One possible plot could be that Harry is under a powerful dark spell. The transformation into a dragon might be a part of a scheme by Voldemort or his followers to either discredit Harry or use his new form for some evil purpose. Maybe Harry has to learn to control his dragon form in order to fight back and protect Hogwarts and his friends.
Well, perhaps in this fanfiction, Harry Potter discovers he has some sort of divine connection to the dragon god. Maybe he gains the ability to communicate with dragons and uses their powers to fight against Voldemort. He could also be on a quest to understand the nature of this newfound connection and how it relates to the wizarding world.
In such a fanfiction, perhaps Harry discovers a dragon in the Forbidden Forest. He realizes the dragon is being hunted by dark wizards. Harry, using his skills and magic, decides to protect the dragon. They form a bond as Harry spends time understanding the dragon's needs and communicating with it through magic. Eventually, the dragon becomes his ally in fighting against the dark forces in Hogwarts.
One possible plot could be that Harry has to keep his true dragon form a secret while at Hogwarts. He might face challenges like controlling his dragon instincts during classes or Quidditch games. For example, his natural inclination to hoard things could get him into trouble in the common room when he tries to stash away everyone's shiny objects.
Well, perhaps the plot could involve Harry finding a dragon egg and raising the dragon as his familiar. This would bring a whole new set of adventures as he has to hide the dragon from the Hogwarts faculty who might not be too keen on a dragon on campus. He could also use the dragon's special abilities to his advantage in his battles against Voldemort.
Well, perhaps Harry could discover he has some dragon - like abilities. Maybe he can breathe a bit of fire when he's extremely angry. It would make him even more of an outcast at first, but then these abilities could help him in battles against Voldemort.