Athanatos could be a great villain. He's a powerful and immortal being who has been sealed away for centuries. But with the disruption of ancient magic (maybe caused by Lara's latest adventure), he is freed. He wants to conquer both the mortal and the Amazonian worlds. Lara's knowledge of archaeology and Wonder Woman's combat skills would be put to the test against his dark magic.
A possible plot could be that there is a powerful and mysterious force that is causing chaos in different parts of the world. Both Lara Croft and Wonder Woman are independently investigating it. Eventually, they meet and decide to team up. They travel to different locations, from ancient ruins to modern cities. During their journey, they exchange stories about their past adventures and develop a mutual respect. They then use their combined knowledge and powers to track down the source of the chaos, which turns out to be a mad scientist who wants to use the power of the gods for his own gain.
They might have some similarities in the action and adventure elements, but they are separate franchises with their own unique storylines and characters.
They both feature strong female leads. But Wonder Woman is more about superhero powers and justice, while Tomb Raider focuses on adventure and exploration.
Aside from Lara and Nathan, there could also be supporting characters from both series. For instance, from Tomb Raider, we might see Lara's trusty sidekick if she has one in the particular fanfiction. And from Uncharted, perhaps one of Nathan's friends who provides some comic relief or extra help during their adventure. However, the focus would mainly be on Lara and Nathan as they are the most well - known and have the most potential for an interesting dynamic.
Cheetah could be a great villain. She has a connection to Wonder Woman already, but in a crossover, she could be working with some of Batman's rogues like the Penguin. The Penguin could provide the resources while Cheetah does the dirty work in combat against Batman and Wonder Woman.
Lex Luthor could be a great villain. He could be after some technology in Spiderman's world that he wants to use to enhance his power in his own battles against Superman. At the same time, he might see Wonder Woman as a threat to his plans of world domination. He could use his intelligence to create complex traps and weapons. His corporate power would also allow him to manipulate situations in both the worlds of Spiderman and Wonder Woman.
Lex Luthor could be a great villain. He could be jealous of the relationship between Superman and Wonder Woman and create a plan to turn them against each other. He might use his intellect to create weapons that can target their weaknesses.
A crossover with the Assassin's Creed series could also work well. Lara Croft might find herself in the middle of the conflict between the Assassins and the Templars. She could learn about their hidden history and use their ancient techniques while still relying on her own methods of survival and discovery.
Well, one possibility could be that Naruto, with his ninja skills, teams up with Lara Croft in a tomb raiding adventure. Maybe they are searching for a powerful artifact that has ties to both their worlds. Naruto could use his shadow clones to help in exploring different areas of the tomb at the same time, while Lara uses her knowledge of ancient languages and traps.
A Tomb Raider and Uncharted crossover fanfiction could be about Lara Croft and Nathan Drake teaming up. Maybe they start off as rivals, both after the same ancient artifact. But as they face various traps and enemies, they realize they need to work together. They could share their skills, with Lara's survival skills and Nathan's sense of adventure complementing each other.