Well, 'perfect cell crossover fanfiction' could be about taking the character of Perfect Cell from Dragon Ball Z and crossing him over into different universes or storylines within the fanfiction world. It might involve him interacting with characters from other anime or even creating new scenarios and power - level battles.
One way could be through some sort of advanced alien technology. In many super fanfics, aliens have technologies far beyond human understanding. They might be able to manipulate cells at a molecular level and bring a dead cell back to life.
One aspect to consider in Dragon Ball Z Perfect Cell fanfiction is the character development. Writers often explore Cell's potential for redemption or further evolution. For example, some fanfictions might depict Cell having a change of heart after his defeat, perhaps realizing the futility of his actions. Another interesting point is the power scaling. Fanfic authors might introduce new power - ups for Cell or the other Z - fighters, creating unique battles that we didn't see in the original series. Also, the relationships between characters can be re - imagined. Maybe Cell forms an unexpected alliance with a Z - fighter, which would completely change the dynamics of the story.
One interesting story could be about Cell somehow getting transported to the Naruto universe and having to adapt to the chakra system. Maybe he starts learning ninjutsu and forms unique combinations with his own powers.
One great Dragon Ball Z Perfect Cell fanfiction is 'Cell's Redemption'. It shows Cell having a change of heart and using his powers for good. Another is 'Cell in Another Dimension' which explores what would happen if Cell was transported to a different universe. There's also 'The True Power of Perfect Cell' which focuses on Cell unlocking new and unexpected powers.
Frieza could be a great antagonist. He might see Cell's power as a threat and try to eliminate him while the OC is caught in the middle. Frieza could also try to use the OC to his advantage against Cell, creating a complex web of power struggles.
Obviously, Naruto himself is often a main character. His unique abilities and strong will make him a central figure when paired with Cell in fanfiction.
You can start by looking on popular fanfiction websites like FanFiction.net or Archive of Our Own. Just search for 'perfect cell crossover' and you'll likely find a bunch of different stories.
Obviously, Cell himself is one of the most popular characters. Since the fanfic is centered around him, fans love to explore his character further. Goku also remains popular as he is often pitted against Cell in these fanfics. Vegeta is another one. His rivalry with Goku and his own quest for power make him a great addition to any story involving Cell. And then there's Trunks, who has his own unique abilities and backstory that can be intertwined with Cell's story in interesting ways.
Well, one interesting concept could be new power - up forms for the characters. For example, a fanfic might introduce a unique form for Cell that combines the abilities of different Saiyans in a completely unexpected way. Another concept could be alternate timelines where Cell has different fates. Maybe in one timeline, he becomes a hero instead of a villain. And also, there could be concepts about Cell's family or origin that are explored more deeply, like his creator having some secret motives that are not shown in the original series.