One of the most popular characters could be Charizard. Its large and imposing figure, along with its powerful fire - based attacks, makes it stand out. In the 'pokemon high school dxd fanfiction', it could be seen as a sort of guardian or a powerful ally. Additionally, Koneko Toujou from High School DxD might be popular. Her quiet and strong - willed personality, combined with her nekoshou abilities, could lead to some interesting scenarios when she encounters Pokemon. For example, she might be intrigued by cat - like Pokemon or use her strength to help in Pokemon - related tasks.
Issei from High School DxD is often a popular character in these crossovers. His perverted yet determined nature can create some interesting interactions when combined with the Pokemon world. Maybe he tries to use his charm on female Pokemon trainers or gets excited about rare Pokemon in a way that's similar to his reactions to girls in the original series. Another popular character could be Pikachu. Pikachu's cute appearance and powerful electric attacks make it a favorite, and seeing it interact with the characters from High School DxD can be really entertaining.
Rias Gremory is also quite popular. When she is paired with Alucard in fanfiction, their different personalities and powers create interesting scenarios. She is a strong and intelligent character, and her relationship with Alucard can range from friendly cooperation to a more complex, power - based relationship.
May is often a very popular character. She's enthusiastic about Pokemon contests and has a great character arc. Drew is also popular, as he serves as a rival and has his own charm. And of course, Ash, who is always involved in some way in the Pokemon world and often has interactions with the Contestshipping characters.
Issei is often a popular character in such fanfictions. His original character traits from the High School DxD series combined with the new elements from the gamer cheat concept make him very interesting.
Naruto Uzumaki is often a very popular crossover character. His status as a powerful ninja and his unique personality make him stand out. Fans like to see how he would interact with the characters from High School DxD.
Issei from High School DxD is also popular in crossovers. His pervy nature could create some humorous situations when interacting with the more serious Naruto characters. Also, his power as a devil and his ability to boost his power through his perverted desires can be an interesting contrast to the chakra - based powers in Naruto.
Edward Elric is often a popular character. His brash and determined personality can create some really interesting storylines when combined with the world of High School DxD. He might get into all sorts of trouble or challenges with the devils and other characters there.
Rias Gremory is also highly favored. Her beauty, power, and leadership qualities make her an interesting character to write about. In an Akatsuki High School setting, she could be leading her peerage in new challenges, like dealing with rival clubs or facing off against new threats within the school.
Akeno is another fan - favorite. Her dual nature, being both sweet and somewhat sadistic, can be explored in different ways in fanfiction. At Sans Seraphim High School, she could be involved in a love triangle or be the key to solving a mystery related to the school's dark past.
One popular pairing could be Gohan and Rias. Their personalities are quite different, with Gohan being more reserved and Rias being a strong - willed devil. The contrast between their powers and backgrounds could create an interesting dynamic in the fanfiction.
One of the popular characters might be Pikachu. Since it's such an iconic Pokemon, it could have some really interesting interactions in the DxD world. Maybe it uses its electric powers in new and unexpected ways.