For a "Heroic" Theseus:
* Chris Pine: Known for his strong presence and ability to portray both vulnerability and strength, Pine could embody the classic heroic ideal of Theseus. Think his roles in "Star Trek" and "Wonder Woman."
* Henry Cavill: With his physique and commanding presence, Cavill fits the archetype of a classic Greek hero. He's portrayed Superman, but also played a more complex character in "The Witcher."
* Tom Hiddleston: Known for his charisma and ability to portray both strength and intellect, Hiddleston could bring a nuanced approach to Theseus's heroism. Consider his role as Loki.
For a More "Complex" Theseus:
* Dev Patel: Patel has shown an ability to play characters with depth and inner conflict, making him well-suited for a Theseus who is not simply a hero but also struggles with his own flaws and motivations. See "Slumdog Millionaire" or "The Green Knight."
* Oscar Isaac: Isaac excels at bringing a brooding intensity to his roles, potentially capturing the darker aspects of Theseus's character. Consider his roles in "Ex Machina" or "Dune."
* Benedict Cumberbatch: Cumberbatch has a talent for portraying complex and intelligent characters with both inner turmoil and moral ambiguity, which could be a good fit for a Theseus who grapples with his past and the consequences of his actions.
Ultimately, the best actor to portray Theseus depends on the specific interpretation of the character in the given story. Are you looking for a pure hero, a complex individual, or something in between?
Let me know if you have a specific vision for Theseus and I can give you a more tailored recommendation.