Who would be the most interesting character interactions in a 'transcendent ichigo x dxd crossover fanfiction'?

Definitely Naruto and Issei. Issei is all about his perverted ways and getting stronger, while Naruto is focused on protecting his friends and achieving his dreams. Their clash of personalities would be really interesting. Naruto might not understand Issei's obsession with girls at first and try to set him straight. And Issei would be amazed by Naruto's power and want to learn from him.

Ichigo and Edward would be really interesting. Ichigo, with his brash and head - on attitude, would contrast with Edward's more brooding and cautious nature. They could have debates about what it means to be immortal, as Ichigo has his own reasons for being immortal that are different from Edward's vampiric immortality. Also, Ichigo's combat skills could be something that Edward admires and wants to learn from, while Ichigo might be interested in Edward's mind - reading ability.

One possible plot could involve Ichigo's spiritual energy causing a ruckus in the DxD world. His power might be misinterpreted, and he has to prove that he's not a threat. At the same time, he could learn some unique abilities from the DxD characters, and they from him. For example, the devils in DxD might be interested in Ichigo's zanpakuto and its powers, while Ichigo could gain some knowledge about magic from them.

Naruto and Issei would be really interesting. Naruto, with his positive and determined attitude, would contrast with Issei's more pervy and hot - blooded nature. They could learn a lot from each other. Another interesting interaction could be Naruto and Sirzechs. Sirzechs, as a powerful devil king, would be intrigued by Naruto's power source, the Juubi. And Naruto would be interested in Sirzechs' leadership and power management in the devil world.

Itachi and Rias would be really interesting. Rias is used to being in control and having power, but Itachi's calm and collected nature along with his overwhelming power would put her in a different position. She would likely be intrigued by his Sharingan and his combat abilities. Itachi, on the other hand, would be dealing with a different kind of power structure and would have to navigate the social hierarchy of the devils in Highschool DxD.

Ichigo and Akeno could also be an exciting pairing. Akeno has her own unique powers and a mysterious side. Ichigo's straightforwardness and strong moral code could contrast with Akeno's more complex nature. They could work together in battles, with Ichigo providing the brute force and Akeno using her strategic and powerful attacks.

One interesting character to crossover with Ichigo is Light Yagami from Death Note. The clash between Ichigo, who is a protector, and Light, who is a morally ambiguous character with the power to kill, would be very engaging. Saitama from One - Punch Man could also be a great choice. Saitama's overpowered nature and Ichigo's journey to become stronger would make for an interesting story. And what about Alucard from Hellsing? His vampire powers and Ichigo's powers related to the afterlife would create a really dark and exciting crossover.

The interaction between Illya and Rias would be really interesting. Rias is a powerful devil with a lot of charm and leadership. Illya, on the other hand, is a magical girl with her own set of powers. They could start off as rivals, both vying for the attention or respect of other characters, but then realize they have more in common and can work together.

Gohan and Issei would be really interesting. Issei is all about being a pervert and getting stronger in his own way. Gohan is this powerful yet humble Saiyan. Their different outlooks on power and relationships would create a lot of humorous and thought - provoking moments.

The Doom Slayer and Vali would make for an exciting interaction. Vali is a very powerful and ambitious character in High School DxD. He would likely see the Doom Slayer as a rival or a potential ally in his quest for power. The two of them could engage in some epic battles or team up against a common enemy. Additionally, the interaction between the Doom Slayer and Koneko would be interesting. Koneko is a quiet and strong - willed character, and she might be curious about the Slayer's motives and his unwavering dedication to his mission.