Meliodas, The Dragon sin of Wrath

Dragon's Sin Of Wrath

Betraying the Ten Commandments, Meliodas cuts ties with the Demon race to pursue his love for Elizabeth, a member of the Goddess race. Even though he was always kind-hearted, Meliodas received the Sin of Wrath when he destroyed Danafor after failing to protect Elizabeth.
3000 years ago, Meliodas was a demon, second in power only to the demon king himself, and leader of the ten commandments.
After his time in Purgatory, due to having lost some of his emotions, Meliodas' personality changes drastically whenever he uses the black mark, becoming far more ruthless and at times even sadistic in his battles and wasting no time in his attempts to kill his former demon allies.
Despite his adolescent appearance, Meliodas is actually a demon who is over three thousand years old. Meliodas is later revealed to be the son of the Demon King and original leader of the Ten Commandments, possessing the fragment of his father's soul embodying Love.