One interesting concept could be a crossover with a time - traveling detective story. The terminator could be chasing a target through different time periods and the detective tries to stop it, adding a new layer of mystery to the story.
Another concept is a crossover with a magical world. Imagine a terminator trying to hunt down a target in a world full of wizards and magic. The clash between high - tech and magic would make for a very exciting story.
Another concept might be the TX teaming up with humans. In some fanfiction, a reprogrammed TX could use its advanced combat skills and knowledge of Skynet to fight against the machines that have gone rogue from Skynet's original plan. This creates a really interesting dynamic as it's a former enemy now on the side of humans.
Well, in some fanfictions, there might be a story where the synthetic - organic hybrids in Mass Effect are pitted against the pure - machine Terminators. Maybe the Geth, with their evolving intelligence, try to understand and either ally with or combat the Terminators. This creates a whole new dynamic as their motives and methods are so different.
One interesting concept could be the unique backstories created for Original Characters (OCs). For example, an OC might be a survivor from a previously unmentioned outpost who has developed special skills to fight Terminators. Another concept could be new relationships formed between the OCs and the existing characters from the Terminator Salvation universe. This could add new dynamics to the story.
Another concept is the struggle with identity. A terminator - human hybrid might question whether it is more machine or more human. It could be constantly torn between its programmed directives from the Terminator side and the more instinctive, emotional responses of its human side. This internal conflict can create a lot of interesting storylines.
A third idea is that the technology of the Terminator world somehow gets mixed with the magic and technology of RWBY. So there could be Terminators that are powered by Dust or have abilities that combine both mechanical and Dust - based powers. The heroes of RWBY would have to learn about this new threat and find a way to combat it, perhaps by teaming up with some of the human resistance from the Terminator side.
One idea could be that the T - 3000 teams up with a character from another universe to fight a common enemy that threatens both their worlds. For example, it could be a powerful alien force.
One interesting concept could be Shreck crossing over with other fairytale characters in a modern setting. For example, Shreck meeting characters from 'Cinderella' in a bustling city. It can create humorous and unexpected interactions, like Shreck's gruff nature clashing with Cinderella's elegance.
One interesting concept could be the combination of Ben 10 000's powers with other fictional universes. For example, if he were to cross over with the DC universe, seeing how his alien forms interact with super - heroes like Superman or Batman. Maybe his Four Arms form could have an epic battle with Doomsday.
Well, a lot of fgo crossover fanfiction involves different historical periods colliding. Say, a crossover with the Roman Empire era and the modern day in the fgo world. Servants from different eras teaming up or facing off against each other can create really engaging storylines. Also, crossovers with other JRPGs like 'Final Fantasy' often bring in unique magic systems and character designs that add a whole new dimension to the fgo fanfiction.
Another concept might be a crossover with a superhero universe. Picture the Metalocalypse band members having to deal with superheroes and villains. They could use their music in unexpected ways, like using a powerful guitar solo to stun villains or inspire superheroes in battle.