One Piece's Luffy would be a fun character to include. His carefree and positive attitude would contrast with Akira's more serious and often tortured nature. They could team up to fight a common foe, like a powerful pirate or a devilish entity that threatens both their worlds. And Mikasa Ackerman from Attack on Titan. Her combat skills and loyalty could pair well with Akira's powers as they face the Titans or other threats in a crossover scenario.
In a crossover fanfiction with Akira Fudo, characters like Lelouch from Code Geass could be great. Lelouch's strategic mind combined with Akira's power would be a formidable combination. They could plot against a common enemy, like an evil empire that rules over both of their worlds. Another good character would be Edward Elric from Fullmetal Alchemist. Edward's knowledge of alchemy and his quest for the truth could interact interestingly with Akira's journey as a devilman.
Guts from Berserk would be an interesting addition to an Akira Fudo crossover. Both characters have a dark and brooding side. They could bond over their shared experiences of fighting against powerful and often inhumane forces. Also, Light Yagami from Death Note. The clash between Light's sense of justice through his Death Note and Akira's more instinctual fight as a devilman would create a lot of tension and interesting plot points.
Chapter 605, "The Plan to Surround and Annihilate Team Q Commences!", is the clearest early answer because it turns Su Yinwan's situation into a concrete plot event. The chapter gives readers a real answer by opening on The thirty-odd people lurking by the shore were just like today's...
Chapter 2 is the strongest chapter-level answer because it starts from On the top floor of the Financial Building, a gathering of dark clouds... and follows through on Jiang, Lin Manru, turned pale and quickly explained, "It's not eloping, my....
Chapter 614, "Storm Crisis", is the clearest early answer because it turns Zhao Lang's situation into a concrete plot event. The chapter gives readers a real answer by opening on Today, the wind on the island was stronger, and for safety reasons,...
Chapter 672, "Wealth Brings Wealth, the Early Bird Catches the Worm!", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event. It opens with The president immediately stood upright, "We are all officially...
Chapter 776, "Sister Li Keeps a Toy Boy?", is the clearest early answer because it turns Jiang Shixu's situation into a concrete plot event. The chapter gives readers a real answer by opening on Apart from the two of them, some other users had started following...
Chapter 647, "Let's Have a Sword Dance!", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event. Early on, Before long, the aroma of meat began to waft through the air, and....
Chapter 813, "She Has a Child?!", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. It opens with In the past, he might have helped Meng WanZhi speak. and closes on Before long, a taxi stopped outside the door, and a round-faced girl....
Chapter 766, "Young Master Gu, Please Come Inside!", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. The chapter gives readers a real answer by opening on Young Master Gu!" Rong Kexi instantly put down her phone and rushed...
Chapter 505, ""Postpartum Care for Sows", is the clearest early answer because it turns Gu Qiang's situation into a concrete plot event. The chapter gives readers a real answer by opening on Zhao Lang laughed, but his eyes became considerably clearer, "Is...
Chapter 701, "Let Bai Lu and Chen'an Terminate the Contract", is the clearest early answer because it turns Miss Jiang's situation into a concrete plot event. The chapter turns that into something concrete by moving from Miss Jiang, that move of yours was totally awesome!" Shao Changqing...