Well, it depends on the context of the fanfic. If he jumps, he could be in a situation where he believes it's the only way to escape a powerful dark force on the tower. However, his Gryffindor courage might also lead to an unexpected rescue. For example, a phoenix could swoop in and carry him to safety at the last moment.
If Harry Potter jumps from the tower in a fanfic, it could be a really dramatic moment. He might be pushed to this extreme by a powerful enemy or a difficult situation he can't solve otherwise. Once in the air, he could discover new magical abilities within himself, like the power to fly without a broom, which could be a major turning point in the fanfic's plot. His friends would probably be horrified and try to rescue him, and this event could also lead to a change in the relationships between the characters.
In fanfiction, if Ash jumps off Prism Tower, he could be caught by a flying - type Pokemon like Pidgeot. Pidgeot, being loyal to Ash, might sense his distress and swoop in to save him at the last moment.
He might be quite amused. Fanfics often contain different interpretations of the characters and the wizarding world. He could find some creative ideas in them that he never thought of before, like unique magical spells or new backstories for his friends.
Well, he could bring his magic skills to the team. Maybe he could use spells to enhance the Avengers' weapons or defenses. For example, he could put a protection charm on Iron Man's suit to make it even more resistant to attacks.
In such a fanfic, Harry might experience extreme pain and weakness. His friends would likely be in a panic. Hermione would probably immediately start looking for antidotes in the library or with her vast knowledge of potions. Ron would be by Harry's side, trying to keep him conscious and reassuring him.
One possible plotline could be Harry's reasons for jumping. Maybe he's under the influence of a dark spell and jumps to break free from it. Another could be that he jumps as a sacrifice to save his friends, believing it's the only way.
Well, he might start collecting Pokemon cards instead of magic ones. He could try to use spells to catch Pokemon, which would be really interesting.
Well, in a 'Harry Potter adopted by Delacours' fanfic, it could be really interesting. Harry would be part of a family that has a different set of values and customs. The Delacours might train him in unique ways of magic that are more in line with Beauxbatons. He could get to know the Veela heritage better, and perhaps it would give him some advantages in his magical abilities. Also, there could be new storylines around his interactions with the Delacour family members and how they deal with the fame and danger associated with Harry.
Well, it would be a really dark take. Harry would probably be constantly in a state of near - despair. Since Dementors are soul - sucking creatures, he might have a hard time forming normal relationships. His view of the wizarding world would be very different from the original story. He might see it as a place full of threats and darkness rather than a place with some good in it. And his Patronus, if he could even produce one, would be very weak or have an unusual form.
In a fanfic where Harry Potter gets a lawyer, it could lead to some really interesting plot developments. Maybe the lawyer helps him deal with the legal mess left by the Ministry of Magic's previous actions against him. For example, clearing his name regarding the false accusations of being a dark wizard or dealing with property rights issues related to his family's estate at Godric's Hollow.
Well, he'd probably become super powerful. The symbiote could enhance his magic skills and give him some cool physical abilities like super strength and agility. Maybe he could use it to fight the Dark Arts in a whole new way.