Who is the hero character of the adventure movie which was released on 2016/3/4?
released on 2016/3/4 refers to release_date = '4-Mar-16'; adventure movie refers to genre = 'Adventure' ;
SELECT T1.hero FROM characters AS T1 INNER JOIN movies_total_gross AS T2 ON T2.movie_title = T1.movie_title WHERE T2.genre = 'Adventure' AND T1.release_date = '4-Mar-16'