Something recently came to mind and that is who I find to be a suitable choice to provide the voice of Ben 10,000/adult Ben Tennyson; especially for the direction for the redesign that I discussed here. That choice is Reuben Langdon, the voice of Dante from Devil May Cry 3 to the recently released Devil May Cry 5. Thinking back to Dante as a character and Langdon's performance of him (most notably his DMC5 performance), I find that Langdon would be a suitable choice to provide the voice of an adult Ben Tennyson. Dante is an incredibly cocky and fun-loving individual and the same can pretty much be said for Ben as well. Cocky and fun-loving while still treating more serious situations with, well, seriousness and focus. Plus, I also find Langdon's DMC5 Dante performance to also sound like a proper match for an adult Ben. If I were to imagine how Ben would sound like as an adult based on the voice that Tara Strong is well known for displaying, I say that Langdon's voice would be a very close match. Feel free to check out Dante in DMC5 and see for yourself if that sort of voice and this very voice actor would indeed be a good choice to voice an adult Ben or not.