Superman would be really interesting. Ichigo, coming from a world of spiritual powers, would be in awe of Superman's physical strength. And Superman would be curious about Ichigo's ability to see and interact with souls. Their different power sets and moral compasses could lead to some great character - building moments. For example, Ichigo might learn about the importance of using power responsibly in a more global sense from Superman.
Definitely The Flash. The Flash's super - speed is a very different kind of power compared to Ichigo's. If they were to team up, Ichigo would have to figure out how to keep up with The Flash. And The Flash could be fascinated by Ichigo's ability to move between the living world and the afterlife. They could have some really fun adventures together, like chasing a villain who can also manipulate time or space, and Ichigo could use his spiritual powers to help The Flash understand the nature of the strange phenomena they encounter.
Ichigo and Edward Elric would make an interesting pairing. Ichigo's brash and impulsive nature combined with Edward's hot - headedness yet intelligent approach could lead to some great interactions. They could learn from each other's combat styles and ways of thinking. Also, both are on a journey to protect something - Ichigo his friends and the Soul Society, and Edward his brother and his quest for the Philosopher's Stone.
Superman would be really interesting. Their powers are quite different. Superman is an alien with a wide range of powers like flight, super - strength, heat vision etc. The Hulk, on the other hand, is a being of pure rage with ever - increasing strength. Their encounter could be a clash of ideologies as well. Superman stands for truth, justice and the American way, while the Hulk is often just a force of destruction when enraged. It would be fascinating to see how Superman tries to calm the Hulk down or how the Hulk reacts to Superman's attempts at peacekeeping.
Ichigo and Maka would be really interesting. Maka is all about order and the pursuit of making her weapon, Soul, into a Death Scythe. Ichigo, on the other hand, has his own code as a Soul Reaper. They could clash over their different ways of dealing with souls and the afterlife, but also learn from each other.
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.
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.
Ichigo is quite headstrong and impulsive. Erza, on the other hand, is more disciplined. So initially, there might be some clashes. Ichigo might act without thinking, which could annoy Erza. But as they get to know each other, Ichigo would probably respect Erza's leadership skills. Erza would also come to appreciate Ichigo's raw power and his kind heart.
Ichigo and Issei would be really interesting. Ichigo, with his calm and collected nature most of the time, compared to Issei's more pervy and hot - headed ways. Their different personalities could lead to some really funny and intense interactions, especially when it comes to fighting side by side or arguing about battle strategies.
Naruto has a strong case for being the most powerful. His Nine - Tails chakra mode makes him incredibly strong, fast, and durable. He also has a vast array of ninjutsu at his disposal. In a crossover, he could potentially learn to use Ichigo's reiatsu in some way, making him even more powerful. Plus, his never - give - up attitude could give him an edge in a tough battle against Ichigo.
Well, in an 'ichigo and dc crossover fanfiction', perhaps Ichigo's Hollow powers could be mistaken for some kind of new meta - human ability in the DC universe. The Justice League might initially view him as a threat and try to contain him. But then, when they realize he's there to fight a greater evil, like Darkseid who has somehow tapped into the spiritual energy of Ichigo's world, they join forces. Ichigo could also share his knowledge of the afterlife with characters like Constantine, which could lead to some really interesting storylines.