Asta in High School DxD Fanfic: How could Asta's character be integrated into the High School DxD universe?

He could form a friendly rivalry with Issei. Since Issei is all about power and his Boosted Gear, and Asta is super determined with his anti - magic sword, they could compete in terms of strength and growth. They might also learn from each other's combat styles.

One way could be through the power system. The EMS (Eternal Mangekyou Sharingan) from Naruto could be a unique power that a character in the High School DxD world acquires. Maybe a transfer student from a hidden ninja village arrives at the high school and has to keep their EMS a secret while dealing with the devils and angels in the school. This could lead to some interesting battles and interactions as the powers of the EMS, like the ability to use powerful jutsus, contrast with the magic and abilities of the High School DxD characters.

Naruto might also interact with the Juubi on a more strategic level. He could plan with the characters from High School DxD to contain the Juubi first. For example, using the barriers and spells available in the DxD world along with his own shadow clone jutsu to surround the Juubi. Then, they could work on finding a more permanent solution, like using some ancient magic from the DxD universe combined with Naruto's sealing jutsu.

The OC can have pre - existing relationships with some of the minor characters in the High School DxD world. For example, they could be an old friend of a side character who then gets introduced to the main group. This way, it feels more natural for them to be part of the story.

Well, start by making the character unique. In a world full of angels, devils and other religiously - themed beings in High School DxD, an atheist stands out. They might be constantly surrounded by things that go against their beliefs. Show how they deal with it. Do they keep their head down or do they actively oppose? Their journey of staying true to their atheism while being in this wild world can be very interesting to write about.

His chakra control is another aspect. In DxD, he could use his chakra control to enhance his physical abilities even more than the normal superhuman strength in the DxD world. He could also use it to sense the presence of different beings, similar to how he senses chakra in his own world.

One way is through a reincarnation plot. Naruto could be the reincarnation of a primordial god. So, he has the dormant powers within him that start to awaken in the High School DxD world. This would give him an edge in battles and also make him a target for various factions who either want to use his power or are afraid of it.

High School DxD's story is considered good by many. It offers a unique blend of genres and has a decent amount of depth. The character interactions and world-building add to its appeal. But, as with any story, it depends on personal preferences.

It's quite engaging. The story of High School DxD has a unique blend of action, fantasy, and romance that keeps readers and viewers hooked.

It's quite wild and filled with exciting and unexpected elements.