Another plot twist could be a shared enemy that neither the Devil May Cry nor the Dead or Alive characters were expecting. Maybe a powerful demon that has the ability to manipulate the very fabric of the Dead or Alive's tournament world. This would force the two groups of characters to team up in ways they never thought possible. The characters would have to learn to communicate and combine their different combat techniques, like Dante's swordsmanship with Ryu Hayabusa's ninja skills.
One exciting plot twist could be a character from Devil May Cry suddenly losing their powers in the Dead or Alive universe and having to rely on the skills and fighting styles of the DOA characters to survive. For example, Dante might find that his devil trigger doesn't work as expected, and he has to learn the acrobatic and martial arts moves of Kasumi or Hayabusa to face the new threats in this strange crossover world.
A really interesting plot twist could be a love interest between a character from Devil May Cry and one from Dead or Alive. Imagine if Nero fell in love with Helena. This would not only create an emotional sub - plot but also cause some internal conflicts within the groups. Nero might be torn between his duties in Devil May Cry and his newfound feelings, while Helena would have to deal with the implications of being involved with someone from a completely different world.
The characters from Dead or Alive, like Kasumi, are known for their agility and precise martial arts moves. If they were to team up with characters from Devil May Cry, they could learn from each other. Kasumi might learn how to use Dante's guns in combination with her kunai. On the other hand, Dante could pick up some of Kasumi's acrobatic flips and use them to enhance his own combat style. It would be a really interesting blend of two very different combat styles.
Perhaps a plot twist where one of the main Avengers, like Captain America, is actually a reincarnation of a hero from the Devil May Cry world. This would bring in a whole new backstory for him. He would start to show abilities related to Devil May Cry, like being able to sense demons or having enhanced sword - fighting skills. It would also create a conflict within him as he tries to balance his newfound identity with his role as an Avenger.
One idea could be Dante from Devil May Cry being mistaken for a new, powerful superhero in the MCU. He then has to deal with the Avengers being both curious and slightly suspicious of him. Another plot could involve Vergil somehow getting caught up in a battle against a major MCU villain, like Thanos. Maybe he initially wants to use the chaos for his own gain but then realizes the greater threat and teams up with the heroes.
Sometimes, a really good plot twist in these fanfics is a character's role reversal. For instance, a usually heroic character from Resident Evil becoming a villain in the presence of Devil May Cry's chaotic and morally ambiguous world. Or vice versa, a devil hunter from Devil May Cry being forced to work for the bad guys in the Resident Evil universe due to some complex situation. This can create a lot of tension and interesting character development.
Maybe in the fanfic, there's a villain who can absorb their powers. So when Supergirl and Flash first encounter this villain, they start losing their powers bit by bit. This forces them to rely on their wits and non - superhuman skills to outsmart the villain and find a way to regain their powers before it's too late.
One exciting crossover could be Naruto using his godlike powers in the Devil May Cry universe. He might use his shadow clones to outwit the demons. Another could be Dante teaching Naruto some sword - fighting skills, which Naruto could then combine with his own ninja techniques. It would be really cool to see Naruto's rasengan in the Devil May Cry setting, perhaps modified with some Devil May Cry magic for an even more powerful attack.
One possible plot could be Dante from Devil May Cry finding himself in the world of Bioshock. He might initially be confused by the strange environment full of splicers and Big Daddies. He could use his combat skills to fight off the threats while trying to figure out a way back to his own world. Maybe he teams up with a Little Sister, using his devilish powers to protect her from the various dangers in Rapture.
One exciting plot twist could be that the Chaos forces from Warhammer somehow corrupt a member of the Justice League. Imagine Superman, under the influence of Chaos, turning against his comrades. It would create a huge internal conflict within the League as they struggle to save him without harming him. Another could be that the technology or magic from Warhammer is introduced to the DC Universe in a way that changes the power dynamics. For example, the Warp magic could give new abilities to some of the villains, forcing the Justice League to adapt quickly.
One exciting plot twist could be that the Infinity Stones have a different origin in this fanfic. Maybe they were created by an ancient race that both the Avengers and Guardians have to discover together. This would force them to work closely and share their knowledge.
A 'devil may cry 4 crossover fanfiction' could be really interesting. It might involve characters from 'devil may cry 4' interacting with characters from other universes. This could lead to some really unique storylines. For example, Dante from 'devil may cry 4' could team up with a character from a different action - adventure game. The fanfiction could explore different power combinations and how they would work together in battles.