In fanfiction, their interaction could start with a misunderstanding. Train Heartnet might be mistaken for a dark wizard because of his appearance and skills. But once the truth is out, they could form an alliance. Harry could introduce Train to the concept of magic and Train could show Harry some of his advanced weaponry and how to use them in a non - magical context.
They could interact in a way where Train Heartnet, being a skilled fighter, could train the students at Hogwarts in combat skills. Harry Potter and his friends might be initially skeptical but then see the value in non - magical fighting techniques. Train, on the other hand, could be amazed by the magic around him and learn a few spells from the wizards.
One idea could be a crossover where Train Heartnet, with his unique skills as a sweeper, somehow ends up in the wizarding world of Harry Potter. Maybe he's on a mission to retrieve a magical artifact that has fallen into the wrong hands in Hogwarts. His combat abilities and sharp senses would make for an interesting dynamic in the magical setting.
Azula might be very intrigued by Harry's status as 'the Chosen One'. She could try to use his fame and power to her advantage. Harry, on the other hand, would be cautious of Azula's devious nature. He would likely be hesitant to trust her completely.
Luna Lovegood might have a unique connection with Belphegor. She often has an open - minded view of strange creatures. She could see past his menacing exterior and try to communicate with him on a different level. Harry and his friends might be initially skeptical of her approach but later realize that her way was the key to dealing with Belphegor, either befriending him or getting rid of him.
Android 18 could be a protector for Harry. Given her strength, she could easily fend off Death Eaters. Harry, in turn, could introduce her to the magical world, showing her spells and potions. For example, she might be amazed by the invisibility cloak and they could use it for some strategic advantage.
Hermione could study the Kubikiribocho. She would pour over books in the Hogwarts library to figure out its origin and powers. Harry, on the other hand, might be the one to actually pick it up and test its abilities in combat. Ron could be a bit skeptical at first but would come around when he sees the sword's potential against the dark forces. For example, the sword might react differently to different spells cast at it. Harry could learn to use these reactions to his advantage in battles.
She might interact with Hermione in a way that challenges Hermione's logical view of relationships. Aphrodite could introduce her to a more emotional and instinctive side of love. They could have conversations about how love is not always something that can be explained by books or logic, and this could lead to Hermione having a different perspective on her own feelings for Ron or other potential partners.
If Gwen Stacy somehow ended up in the wizarding world, she would be a bit of an outlier. Harry Potter, who has always been a bit of an outsider himself, could empathize with her. They could start by helping each other understand their respective worlds. Harry could introduce Gwen to magic like the Marauder's Map, and Gwen could show Harry some of her scientific gadgets. Their interaction might also lead to a romantic relationship, where they combine their skills to protect the wizarding and non - wizarding worlds from threats that span across both.
In a fanfiction, their interaction could be really exciting. Seras Victoria is a strong and often silent character. When she meets Harry, who is a natural leader, there could be some friction at first. But as they face common enemies, like a group of dark wizards who are trying to use vampire blood for dark magic, they learn to rely on each other. Harry could use his magic to protect Seras from anti - vampire spells, and Seras could use her physical strength and vampire senses to help Harry in battles.
They could be allies in a fight against a common enemy. Suppose a dark force from Rhaegar's world and Voldemort team up. Harry and Rhaegar would need to combine their different magical abilities. Harry's ability to use a wand and Rhaegar's connection to dragon - related magic could be a powerful combination to defeat this new threat.
They could interact in a classroom setting. If Jasper were a teacher, he might call on Harry in class. Harry, being the curious and brave character he is, would ask Jasper about his past and his vampire abilities. Jasper could share some of his wisdom about controlling emotions, which could be really useful for Harry who often struggles with his anger towards Snape and his fear of Voldemort.