One unique feature is the blend of magic and extreme situations. In normal Harry Potter stories, magic is used for various things like schoolwork and fighting dark wizards. But in these fanfictions, magic might be used in a more extreme and desperate way inspired by Berserk, like in life - or - death battles where the rules of magic are pushed to the limit.
Another unique aspect is the exploration of darker themes. While Harry Potter has its dark moments, 'Harry Potter Berserk fanfiction' often delves deeper into themes like the corrupting nature of power, the true cost of survival, and the blurred lines between good and evil. This is inspired by Berserk's often gritty and complex exploration of such themes. For instance, the way the Death Eaters are portrayed could be more complex, not just as simple villains, but as individuals with their own motives and backstories that are more intertwined with the overall power struggle in a way that reflects Berserk's take on similar power - related themes.
The character portrayals are different. Characters from Harry Potter may show more of a Berserk - like tenacity and ruthlessness. For example, Harry could be more of a lone wolf type, not relying so much on his friends and taking on challenges with a more brutal and self - reliant approach, similar to some characters in Berserk. Also, the settings can be altered. Hogwarts might not be the safe haven it usually is. There could be more hidden and dangerous areas, or the school could be under a more constant threat that changes the whole dynamic of the story.