Well, he might find a whole new world of magic and powers in Remnant. Maybe he'd meet new characters and form alliances. He could also introduce some of his own magic techniques to the people there.
If Harry goes through the veil to Remnant in fanfiction, it could be really exciting. He would likely be very confused at first. The different culture and magic system in Remnant would be a big shock. He might start exploring and try to figure out how to get back home while also getting involved in the local affairs, like battles against the Grimm. He could potentially use his Hogwarts - trained skills to help the people of Remnant in their fight.
Well, he might find a whole new world of unique Grimm creatures in Remnant. Maybe he'd use his magic in ways that the people there have never seen before, causing both amazement and a bit of fear. He could also meet new allies and enemies, and his journey could be about trying to find a way back home while also getting involved in the local conflicts of Remnant.
In the 'Harry goes through the veil fanfiction', Harry may face a great deal of danger. The veil is often associated with death in the wizarding world. So, perhaps he has to fight off dark forces that lurk on the other side. He might also have to find a way back to the living world, which could involve solving puzzles or making difficult choices. There could be a new set of magical rules there that he has to learn quickly in order to survive.
He'd probably start by trying to understand the new world around him. He'd observe how people interact, how the society functions, and what the threats are. For instance, learning about the Grimm and how they operate would be crucial for his survival.
Well, he might accidentally bring some of the dark forces from his world to Remnant. Or, on the other hand, he could bring new hope and ideas to fight the existing threats in Remnant. His presence could also cause some political unrest as the different factions in Remnant might try to use him for their own gains. And of course, his own journey of self - discovery would be completely different in this new world.
If Harry Potter goes to Remnant in fanfiction, it could be a wild adventure. He'd probably stand out a great deal. His wand - a very important tool in his world - might not work in the same way in Remnant. He could end up learning new forms of combat and magic there. He may also encounter different types of villains and have to use his quick thinking and skills to survive and help those in need.
One possible plot could be that Harry Potter enters the RWBY universe through the veil. He might bring his magic skills and knowledge with him. He could then interact with the RWBY characters, perhaps teaching them some new spells or learning about their unique abilities. His presence could also disrupt the balance in the RWBY world, leading to new conflicts and alliances.
Harry could also get involved in the internal affairs of Remnant. Maybe he'd be drawn into the conflict between the different kingdoms or the fight against Salem. His presence could tip the balance in different ways. He might use his magical knowledge to help develop new weapons or defenses in Remnant, or he could use his ability to communicate with magical creatures to befriend some of the unique fauna in Remnant.
In fanfiction, if Harry Potter falls through the veil, he might end up in a strange and unknown realm. It could be a place full of lost souls or a dimension with different magical laws. Maybe he would have to find a way to escape on his own or meet some unexpected allies there.
Maybe Harry has a deep conversation with Death. He could be seeking answers about the afterlife or the fates of his loved ones who have passed on.
In some fanfictions, when Harry Potter goes through the mirror, he might find himself in a parallel magical world. This world could have different versions of his friends and enemies, and he may have to face new challenges to find his way back to his own world.