One idea could be a crossover with 'Game of Thrones'. Spartacus could find himself in Westeros and get involved in the power struggles there. Maybe he teams up with the Unsullied, given their similar backgrounds in terms of being trained warriors. Another could be a crossover with 'The Witcher'. Spartacus might encounter Geralt and they could fight side by side against some common enemy, like a group of powerful bandits or a monster that has been terrorizing the land. A third idea is a crossover with 'Rome'. Since both are set in ancient times, it would be interesting to see Spartacus interact with the Roman characters from that show, perhaps causing chaos in the already politically charged environment of Rome in that series.
Well, for a Spartacus crossover fanfic, you could consider crossing it with '300'. Picture Spartacus leading his men against the Persians. His fighting skills and the determination of his followers could add a new dimension to the battle of Thermopylae. Or, a crossover with 'Gladiator'. Maximus and Spartacus could meet in the afterlife and exchange their tales of heroism and the fight for freedom. Also, a crossover with 'Braveheart' is possible. Spartacus might learn from William Wallace's strategies of guerrilla warfare and use them in his own battles against the Romans.
A crossover with a modern - day action story could be really cool too. Spartacus and his crew could be brought to the present day through some time - travel mishap. They then have to navigate the modern world, learning about new weapons and technology. They could use their ancient fighting techniques in modern combat situations, like taking on a powerful criminal organization.
You could do a crossover within different fable universes. For instance, take the moral - driven characters from Aesop's fables and put them in the world of Native American fables. The animals in Aesop's fables might learn new values from the Native American fable characters. Also, consider mixing fables from different cultures, like Asian fables and European fables, in a fanfic.
Maybe a crossover with a fantasy world where the Darkness entities interact with magical creatures. For example, they could form alliances or rivalries with elves or wizards, which would lead to a whole new set of adventures and conflicts.
A uzumaki crossover fanfic could involve crossing over with 'Bleach'. Picture an Uzumaki character in the Soul Society, their strong chakra being mistaken for reiatsu. They could bring new fighting styles and techniques to the Bleach universe.
One idea could be a crossover with 'Naruto'. Gon could meet Naruto and they could have a friendly competition in terms of strength and speed. Another idea is a crossover with 'One Piece', where the Hunters from 'HxH' join the Straw Hat Pirates on an adventure. Maybe they could be searching for a rare treasure that has both the allure of the Grand Line and the mystery of the 'HxH' world.
One idea could be a Dalek crossover with the Doctor Who companions. Imagine the Daleks facing off against a group of companions who have to use their unique skills and knowledge to outwit the Daleks. Another could be a crossover with a science - fiction adventure like Star Trek. The Daleks' aggressive nature would contrast greatly with the more diplomatic Starfleet.
One idea could be a crossover with 'Friends'. Jerry could visit Central Perk and have a stand - up comedy session there. His unique sense of humor might either amuse or confuse the 'Friends' gang.
One idea could be a crossover with another popular RPG like Persona. The characters from Twewy could enter the Metaverse in Persona and interact with the Phantom Thieves. They could learn about the different ways of fighting Shadows compared to the Noise in Twewy.
Another interesting crossover could be with a music - themed anime like K - ON!. The Symphogear characters, who are also into music, could have a jam session with the K - ON! girls. And then, unexpectedly, they have to use their combined musical and combat powers to fend off an enemy that is attracted to the powerful music they create.
One interesting idea could be an Overwatch crossover with the world of Harry Potter. For example, Tracer could be a student at Hogwarts, using her time - traveling abilities in magical ways within the school. Another idea is a crossover with the Star Wars universe. Maybe Reinhardt as a Jedi, with his rocket hammer being a unique lightsaber - like weapon. And a crossover with the Lord of the Rings, where Orisa could be a guardian of a certain part of Middle - earth, protecting it from the forces of evil with her shield and gun.