Sairaorg Bael

Role: King Species: Pure-Blooded Devil Sacred

Born as the eldest son of the Bael Clan, Sairaorg did not inherit the Bael's trademark Power of Destruction that Rias and Sirzech's inherited from their mother, who came from the Bael Clan. Because of this, his younger half-brother was appointed to be the next heir of the Bael Clan. His mother told him to become strong in different ways. Sairaorg trained his body to its limits to become powerful and due to this, he defeated his younger half-brother, which made him the next heir of the Bael Clan. After his defeat, the younger half-brother now plans on assassinating Sairaorg. Sairaorg desires to become Satan to prove himself even with his lack of special demonic powers.

(Source: Highschool DxD Wiki)