The unique feature is the combination of two very different universes. Pokemon's world is full of cute creatures with various powers, while High School DxD has a more mature and complex power system. When they cross over, it's like mixing two different kinds of magic.
Well, one unique feature is the character mash - up. Naruto as an Incubus in the Highschool DxD world is very different from his original self. His powers and abilities get a new spin. For example, his chakra control could be related to his Incubus powers in some creative ways.
One unique feature is the combination of two very different universes. 'Highschool DxD' is full of magic, demons, and school - life elements, while 'Doom' is about intense action in a post - apocalyptic, demon - infested world. So in the fanfiction, you might see characters using magic from 'Highschool DxD' to fight 'Doom' demons.
The 'Highschool DxD' light novel stands out because of its complex power system. There are different ranks and abilities among the devils, angels, etc. Also, the story has a lot of fan - service elements, but it doesn't overshadow the main plot which involves political intrigue between the different supernatural factions. The relationships between the characters, especially the harem aspect around Issei, add depth to the story.
One unique feature is the combination of different power systems. You have the spiritual powers from Bleach like Ichigo's Zanpakuto and Rukia's Soul Reaper abilities, and then you have the diverse powers of Pokemon. For example, a Pokemon's electric attack might interact in an unexpected way with Ichigo's Getsuga Tensho.
In 'Percy Jackson Highschool DxD Fanfiction', the character interactions are really unique. For example, Percy might interact with Rias Gremory. His way of thinking, which is shaped by his demigod upbringing, is very different from the characters in Highschool DxD. This contrast leads to some interesting dialogues and situations. Also, the power battles are different as Percy's powers from the Greek world are pitted against the powers in the Highschool DxD world.
One unique feature is the blend of two different mythologies. Highschool DxD has its own set of supernatural beings like devils, angels, and fallen angels. When you add the Grim Reaper concept, it creates a whole new set of interactions. For example, the Grim Reaper might have different views on life and death compared to the devils in Highschool DxD.
Often, the unique feature is the blend of the red dragon concept with the existing highschool dxd lore. For example, the red dragon might bring in new powers or abilities that the regular highschool dxd characters don't have.
One unique feature is the blend of two different and popular genres. The Highschool DxD's supernatural and often racy elements mix with the more cutesy and magical elements of the magical girl genre. For instance, you might see characters with devilish powers also using magical girl - like spells or transformations.
One popular 'pokemon crossover highschool dxd fanfic' might be 'Pokemon in the World of High School DxD'. It often has interesting plotlines where Pokemon are introduced into the High School DxD universe, creating unique interactions between the two worlds.
One key feature is the integration of different universes. For example, how well the rules and elements of the other crossover universe fit with High School DxD. If it's a smooth blend, it's usually a good sign.