Marth was once the greatest swordman the world of Spirit Earth had ever known, he had everything, fame, money, the women of his dreams everything was going his was until he was bested in a duel afterwards he lost everything, well almost everything. After the death of his best friend and her wife he has taken in their young child to make sure he doesn't go down the wrong path. Despite his outward harsh and drunk demeanour he does in fact still care about his world and this child. As the series progresses Marth will grow and become the leader and character people remember him being. For an example of the type of voice I'm looking for Qrow from RWBY is a good example