Sonneillon is a short young man with a skinny body and has dark gray hair.
Sonneillon is shown to be quiet and speaks with short words. Like Gressil, Sonneillon also enjoys fighting powerful opponents and inflicting violence on others in order to show his strength. Sonneillon is considered the most childish among his siblings, becoming easily angered at things not going as planned or even from simple taunting.
Sonneillon was born in the Realm of the Dead, created by Hades with Lilith’s flesh in order to use him for his army in opposition to D×D. At some point, he joined Team Black Satan of Darkness Dragon King under the leadership of Zeno to participate in the Azazel Cup.
Red Dragon Emperor of the Blazing Truth × White Dragon Emperor of the Morning Star: The True Dragon(s) of the Kuoh AcademyEdit
Sonneillon was mentioned in Volume 24, who has the power above Satan-class and may become a Super Devil if his conditions are correct. Under Hades’s orders, Sonneillon became a member of Team Black Satan of Darkness Dragon King to join the Azazel Cup, under the leadership of Zeno. He and his team fought against the Asura prince Mahabali and his team, emerging victorious after Balberith took the flag in the Rating Game.
Sonneillon officially made his first appearance in True Volume 2, offering Balberith to walk with him and Gressil during their free time, but he refused. Sonneillon left with Gressil to pick a fight with people after they leave in frustration after Balberith continued to watch the Oppai Dragon show to study about Issei Hyoudou. Sonneillon and his team were up against Team Babel Belial that was led by Diehauser Belial in the first match of the main stage, but they were defeated because Balberith was using Issei’s Oppai Dragon fighting style, which made him and his team to angrily questioned their ace member, Sonneillon and Gressil were dissatisfied and were about to go on a rampage, disappearing in the end.
In True Volume 3, Sonneillon and Gressil attacked Issei and his group at Kyoto by wishing to defeat Issei as a commemoration before they fight Emna. Wishing to defeat them, Sonneillon took on Yuuto, Rias, Kunou and as he was about to be hit by Yuuto’s Holy Demonic Sword, he shrouded himself in his malicious aura and used his devil specialty Crushing to make Yuuto feel pressure and made his sword appear from the ground and when he used his Crushing again, Yuuto took his distance and the ground was crushed by a force and continued using Crushing, but Yuuto managed to dodge his attacks, leaving holes to appear after the unperceivable force. When Rias fires her Power of Destruction, Sonneillon stopped it by using Crushing to changed its trajectory towards a pole and heighten his aura to continue using Crushing to crush the roads with ominous force and as Yuuto his ability he learned from Souji called Sandanzuki, which sent Sonneillon flying to the side. Seeing Yuuto rushing towards him, Sonneillon used Crushing to target Yuuto’s wrist and pushing his Holy Demonic Sword off, but he didn’t mind and created another Holy Demonic Sword, leaving Sonneillon to continue to target his wrist and as the Holy Demonic Swords appears below him, he turned them into balls and dodge Yuuto’s attempt his slash his head with his Gram by using Crushing to target Yuuto’s feet. Becoming increasingly angered by Yuuto’s taunts, Sonneillon let out his dangerous aura from his body and continued using Crushing against Yuuto, but fails to hit him because of his speed, leaving him even more angrier. Sonneillon then yells to Gressil to let themselves remove their limiters because of his anger towards Yuuto, Rias, Kunou, and believes the higher-ups will forgive them if don’t destroy the whole Kyoto, with Gressil agreeing as they remove their limiters to increase their power until the Hero Faction arrives, forcing the duo to retreat for now.
During the battle in the pseudo-space, near the small river in the east, Sonneillon along with a group of artificial devils engaged the Hero Faction in battle as Sonneillon fought against Cao Cao. Sonneillon engaged Cao Cao in battle, becoming frustrated with the fact that his attacks weren't hitting despite Cao Cao being slower the Yuuto Kiba, with Cao Cao taking notice of Sonneillon's Crushing ability and his habit of using it, as Cao Cao began to dodge all of Sonneillon's attacks which enraged the artificial Devil, as Cao Cao taunted him stating while Sonneillon is a genius, that Cao Cao is a better genius and that if Sonneillon had 5 years of experience, that Cao Cao wouldn't know how their fight would end.
As Sonneillon increased the aura and range of his Crushing ability, Cao Cao jumped in the air to avoid the wide range attack as he activated his Balance Breaker and dodged Sonneillon's attack with his levitation ability and had his orbs surround Sonneillon, creating various copies of Cao Cao to attack Sonneillon. Although Sonneillon tried to crush them, Cao Cao was able to exploit the opening to attack Sonneillon, thrusting his spear into Sonneillon's right shoulder and cutting off Sonneillon's right arm.
Standing over the defeated Sonneillon, Cao Cao offered him the choice of being turned to dust by the Holy Spear or surrendering, as Cao Cao was told by the higher-ups to spare Sonneillon if he surrendered. Sonneillon refused to surrender as he created a Demonic Power Bomb from the corpses of the defeated artificial Devils, which he intended to teleport to Urakyoto as Heracles used his Balance Breaker to stop it. Sonneillon tried to create another Demonic Power Bomb only to have his left arm cut off by Cao Cao and killed by having the Holy Spear thrust in his chest, turning Sonneillon to dust.
Powers & AbilitiesEdit
Immense Demonic Power: A special case among the hundred thousand Devils created by Lilith, Sonneillon‘s demonic power is above Satan-class and he has the potential to become a Super Devil.
- Crushing (圧壊, Aggai): Sonneillon’s signature ability that allows him to "crush" objects and opponents through the use of an invisible force. Generally used from above to flatten opponents, it can also be used in other directions such as to move Sonneillon himself out of the way of attacks. However, he can lose precision easily if he loses his cool, which often happens due to his quick temper.
Immense Strength: Sonneillon’s strength has been proven he was able defeat Ultimate-class devils and several Low-class Gods in their Rating Games in the Azazel Cup. Even with a limiter on, he was able to hold his own against Yuuto Kiba using his Sword of Betrayer and Rias Gremory, being able to deflect Rias' Power of Destruction with Crushing. He was able to hit Yuuto's sword, wrist and feet in different occasions until losing his focus due to the Knight's taunting.
Flight: Being a Devil, Sonneillon can fly using his devil wings.
- Sonneillon comes from the demon Soneillon who is the demon of hatred, the fourth prince of Thrones and tempted mankind to hate.