Kabuto is the most viable option. It has more visual appeal. They may be able to work a good story into it.
I agree. Considering that the writers fucked up on the original story, and that Hiro Mizushima (Tendou) had won the writers' competition just to redeem himself, I don't see how Adness would have a problem trying to match the personality of Kabuto's US counterpart.
I'm honestly rather curious at this point about Adness' take on Double
Double would be more difficult since most of the series is based on the interactions between the characters. They would get less footage to use and they would need to then make a story that can use most of what they have left.
Maybe, but they would have pay some referrences to the Sherlock Holmes franchise if they did adapt Double.
I doubt there's any footage that can be used to make Eternal a good guy. If there is any, there is few and there is not enough to make it happen well. The most would be giving Eternal a few minutes but that only is if he fights Dopants and if he leaves soon.