Alfonse is a main character and protagonist in Fire Emblem Heroes. He is a prince of the Askr Kingdom and a member of the Order of Heroes. He is the older brother of Princess Sharena. He also appears in Dragalia Lost as part of the Fire Emblem: Lost Heroes event.
Being a prince of the kingdom of Askr, people protested when he joined the Order of Heroes, though others felt it was his usual behavior. He was once friends with a fellow member named Zacharias, who eventually disappeared, leaving Alfonse cautious of befriending other heroes.
Official Description (Dragalia Lost)
The young prince of the Askran Kingdom who was sucked through a rift between worlds and deposited in Alberia. Kind and dedicated, he seeks to protect peace along with all the other members of the Order of Heroes.