Today, the guys over at ComicBook.com got a scoop on the secret role that The Wolverine actress Tao Okamoto will be playing in the upcoming Batman v Superman: Dawn of Justice. The report is stating that Tao Okamoto will be playing a LexCorp employee named Mercy. As many know from Superman: The Animated Series then eventually appearing in the comics that Lex Luthor had a bad-ass martial arts fighter named Mercy Graves. When she crossed over to comics she was revealed to be part Amazon like Wonder Woman. Also, in the Young Justice TV Series she was seen as a silent cyborg with arm cannons. But it's unknown if either one of these origins will be used in the movie.
This comes off reports that Lex Luthor (Jesse Eisenberg) will definitely be playing up the evil Mark Zuckerberg angle that many feared he would. A young weaselly type billionaire who knows he has more power than a Senator or Governor. Also have been reports that he will have blonde "surfer" hair. But this report has yet to be confirmed....
A good character arc for Lex Luthor would be Luthor at some point experimenting on himself through some type of radiation to become as powerful as Superman. But the experiment makes him go slightly crazy but it only shows when he is alone. As well as losing his hair due to the radiation. The very last scene of the movie would be Lex losing his hair due to the experiments. But this is all pure fan speculation...
Batman v Superman hits May 2016