Well, it would probably be a very interesting blend. Harry might grow up with the strict discipline and honor code of the samurai. He could learn swordsmanship instead of magic wands at first. Maybe he'd have a sensei figure instead of Dumbledore.
It would be really interesting. Harry might learn martial arts skills from the Samurai way. He could be more disciplined and have a different kind of courage, not just the magic - related courage. His upbringing would probably influence his fighting style when facing Voldemort. Instead of relying solely on spells, he might use some Samurai - like combat moves in duels.
The plot could start with Harry being found by a samurai clan. He'd grow up learning their ways. Then, when he discovers his magical heritage, he has to blend the two worlds. Maybe he uses samurai skills to fight dark wizards.
In this fanfiction, it could be that Harry is raised in a samurai clan. He would grow up with their traditions. He might participate in their ceremonies, learn their code of conduct, and eventually use his samurai training to protect his new family from threats that are both magical and non - magical.
The most obvious difference would be Harry's upbringing. In the original, he grows up in the wizarding world with a wizard family. But in this fanfiction, he'd be in a Samurai - influenced environment. His skills and values would be different. He'd probably be more physically capable in combat rather than just relying on magic spells like in the original.
Harry for sure. Then there could be his samurai mentors. Maybe there would also be some characters from the original Harry Potter world who interact with him in this new samurai - influenced life. For example, Hermione might visit him in the samurai village and be amazed at the new skills he has learned.
Maybe there could be a crossover where some of the characters from Harry Potter, like Hermione, are fascinated by the technology and magic in Samurai Jack's world. They could study the different forms of magic there and try to incorporate it into their own magical knowledge. And in return, they could teach Jack some basic spells to use against Aku.
In many Harry Potter fanfictions, the concept of being 'raised by darkness' can take various forms. It might involve a character being brought up in an environment influenced by dark magic or dark wizards. For example, a character could be raised in a family that secretly practices the Dark Arts. This could lead to the character having a different moral compass compared to those raised in the light. They may struggle with the line between right and wrong, as their upbringing has exposed them to unethical magical practices.
First, do a lot of research on both universes. Know the rules of magic in Harry Potter and the lore of Samurai Jack. This will help you create a believable crossover. For example, understand how spells work in Harry Potter and what Jack's sword can and can't do.