the way you say 'may I' is -te form + mo ii desu ka. 'May I be' could be 'date mo ii da?', although in your case you would probably use the verb 'naru' - to become, which would get you 'anata no kunoichi ni natte mo ii desu ka'.
\"Nonsense, I don\'t think one evil step ahead. I think FIVE evil steps ahead.\"