Character balance can be difficult. Different magical law settings may have different power levels for characters. So, when you cross them over, you need to ensure no character is too overpowered or underpowered. Also, understanding the core concepts of all the magic law systems you're using is tough. There's a lot of research involved to get it right.
One that I think stands out is 'The Magic Law Convergence'. In this fanfiction, the author does an amazing job of bringing together different magical laws. They explain how the magic from one world affects the magic in another world in a very detailed and interesting way. There are also some great character relationships that are formed because of these crossovers, making it a really engaging read.
In Percy Jackson fanfiction, magic law can be portrayed in various ways. Sometimes it's closely tied to the original Greek mythology rules within the series. For example, the use of magic might be restricted by the will of the gods. Magic could also be a more fluid concept, with fanfic authors creating new spells or powers that still fit within the general framework of the Percy Jackson universe. It might be used to drive the plot forward, like a character having to break a magic law to save their friends, which then leads to a series of consequences and adventures.
First, you need to be really familiar with both the Magic the Gathering world and the other universe you want to cross it with. For example, if it's with Star Wars, know the different species, planets, and Force - related concepts in Star Wars, as well as the mechanics, races, and spells in Magic the Gathering. Then, come up with an interesting premise. Maybe a Planeswalker gets lost in the Star Wars galaxy. Start writing, focusing on how the two different magics or powers interact. Keep the characters true to their original personalities as much as possible.
One great 'Magic the Gathering Crossover Fanfiction' is 'Magic Meets Pokemon'. It combines the rich world of Magic the Gathering with the beloved Pokemon universe. The story follows a Planeswalker who finds themselves in the Pokemon world and has to adapt to the different rules and powers there. It's full of interesting battles and unique character interactions.
The theme of conflict is also frequently seen. Whether it's a conflict between Justin Law and the antagonists of the crossed - over world or internal conflict within himself as he adapts to the new situation. For example, in a crossover with the Attack on Titan world, he might have to face the Titans while also dealing with his own moral dilemmas about the nature of the conflict in that world.
Another aspect is that law magic novels tend to show the interaction between the magical laws and the characters. The characters often have to navigate these laws, sometimes finding loopholes or facing moral dilemmas. For instance, a character might be in a situation where following the magical law would mean sacrificing something important, or they might be tempted to break the law for a greater good. This exploration of character and law makes the stories more complex and engaging.
Severus Snape is also a popular choice. His complex character and vast knowledge of magic can create interesting dynamics when he meets characters from different magical worlds. He could either be a mentor or an antagonist in these crossovers.
A common theme is the clash and then the fusion of different power systems. Naruto's chakra - based ninja skills and the magic from the other universe, like spells in Harry Potter or magic in Fairy Tail, often start by being at odds but then find a way to work together.
One idea could be that Naruto is somehow transported to the Young Justice universe and his chakra is mistaken for a form of magic. This could lead to some interesting team - ups and misunderstandings as the Young Justice characters try to figure out who Naruto is and what his 'magic' can do.