Daymond「デモンド」 is Escanor's older brother and prince of their kingdom. Daymond was the reason Escanor was exiled from their kingdom.
Daymond, in a memory, was shown to be a selfish and bratty young boy; jealous over the attention Escanor was getting from their parents and was shown to bully and beat up Escanor when they were children.
Daymond was the king's only son and rightful heir to the Castellio Kingdom until Escanor was born and took his parents attention away from him, making Daymond very jealous and furious toward Escanor. When they were children, Daymond started to bully and insult Escanor. He called him weak for getting close to their parents and, beat him with a stick until Escanor unlocked his Sunshine powers and broke Daymond's arm. This greatly shocked their parents and caused them to disown Escanor, no longer calling him their child and they even ordered their knights to kill him.
Daymond is an ordinary human and does not possess any superhuman abilities.