It could change his personality. Dragons are often seen as fierce and independent. With a dragon's heart, Harry might become more assertive and confident. He could also develop a sense of protectiveness over his friends and Hogwarts that is even stronger than before. On the other hand, he might struggle with the more primal instincts that come with the dragon's heart, like a quick temper or a desire for solitude at times. This internal struggle could be an interesting aspect of the fanfiction, as he tries to balance his human self with the influence of the dragon's heart.
He might gain the ability to breathe fire. Just like dragons, if Harry had a dragon's heart, it could endow him with some of the dragon's physical abilities.
His connection to the magical world could be enhanced. Dragons are very powerful and magical creatures. Having a dragon's heart could mean that Harry has a stronger bond with magic, perhaps allowing him to perform spells more easily or access deeper levels of magic that were previously unavailable to him. It could also attract the attention of other powerful beings in the magical world, both good and bad, leading to new alliances and conflicts.
If Harry Potter becomes a dragon rider in fanfiction, he could explore new magical places. Dragons can fly to remote areas. He might discover hidden magical lands or ancient magic that could help him in his fight against the dark forces. Maybe he'd find a new kind of magic that could defeat Voldemort once and for all.
Well, it could be that the baby dragon has some special powers. Maybe it can communicate with Harry telepathically. This would lead to some really interesting adventures as they bond and learn from each other.
In this fanfiction, Harry might face a lot of challenges. First, he has to figure out how to keep the dragon egg safe. Hogwarts has rules against having dangerous creatures, so he'd need to hide it well. Maybe he'd use magic to create a special hiding place, like a hidden chamber. Then, when the egg hatches, he'd have to deal with a baby dragon, which could be really difficult as dragons are powerful and not easy to control.
Perhaps Harry Potter talks to the dragon to enlist its help in finding a powerful magical object. Dragons are known to guard treasures. He could be on a quest for a Horcrux or some other important item. The dragon might initially be hostile but as they talk, it starts to trust Harry. Their conversation could involve exchanges about the power of magic, the dragon's own experiences in the magical world, and how they can both benefit from working together.
If Harry were a Dragon Animagus in the First Task, it would change the whole dynamic. He could use his dragon form to create a diversion. For example, he could make the real dragon chase him away from the egg, and then quickly transform back and snatch the egg. Also, his dragon form might have some special abilities like breathing fire in a controlled way to fend off the real dragon if it attacks.
In fanfiction, anything is possible. Regarding Harry Potter having a dragon's heart, it could be a central part of a story. For example, perhaps Harry discovers he has a dragon's heart after a strange encounter with a powerful magical creature. This newfound aspect of himself could change his relationships with his friends. Hermione might be intrigued and start researching how it affects his magic, while Ron could be a bit more cautious around him at first, worried that this new part of Harry could make him more dangerous. The concept can open up a whole new world of storytelling within the Harry Potter fanfiction universe.
In a 'Harry Potter marries a dragon' fanfiction, there would be a lot of challenges. First, the wizarding society might not accept such a relationship. But Harry, being the hero he is, would probably fight for it. The dragon could offer him a unique form of protection and companionship. They might live in a special place, away from the prying eyes of the wizarding world, and create their own kind of magic together.
In this fanfiction, Harry might use his magical skills like the Patronus charm to fend off the dragon. Maybe he'd also rely on his broomstick flying skills to dodge the dragon's attacks.
In some fanfictions, Harry Potter might discover a hidden magical object in the bathroom. For example, a secret passage could be revealed behind a mirror or a sink when he's in there alone, leading him to a new adventure or a place filled with ancient magic.
Well, Harry could get involved in some really off - the - wall pranks. Since he's bored, he might decide to play some elaborate tricks on his friends, like magically changing their voices during class.