There are many Anime series that could ( and should of) gone live-action in the U.S. by now,
A lot of them don't because of budget or Cultural stuff within the source material.
Then of course we have those few films that are attempted Like Dragonball Evolution that completely crap on or just show little effort to stay true to what source material should be. Shoot, studios even do that to American made shows ( I.E., Jem, Masters Of The Universe , G.I. Joe, etc...).
One Anime/Manga that should definitely have no problem going live-action on either the big or small screen would be Gunsmith Cats!
It has an entire western cast, it takes place in the United States,and has all the elements of an awesome action movies from the 70's and 80's , How could any studio mess this or pass this series up? Hey, and if the do feel safe with it as a movie , then it would make an awesome NetFlix series!
So what Anime do you guys think could easily be turn live-action by an American studio?