By Piya Sinha-Roy LOS ANGELES (Reuters) – The newest Marvel superhero to reach the big screen does not have the rugged good looks of Iron Man, the muscular physique of Captain America or a cape and hammer like Thor. The Disney Animation studio is coming off the smash Oscar-winning hit “Frozen,” a tale of two princesses that became the highest-grossing animated movie of all time with $1.3 billion in global ticket sales. “Iron Man” helped “turn the ship as far as people taking a chance into science fiction and fantasy,” said Don Hall, who co-directed “Big Hero 6” with Chris Williams.