Diluc Ragnvindr

Diluc Ragnvindr is a tall man, in his early-mid twenties. He has red eyes and hair, which is tied into a low ponytail. He wears a suit with a fur lined jacket, black and red gloves adorned with rubies, and has his Pyro Vision attached at his waist.

The more you get to know him, Diluc sports a new outfit wearing a black dress shirt, a light gray waistcoat with a silver phoenix insignia that is adorned with a red gem in the eye, a silver-accented red tailcoat with four tails, black trousers are similar in design, straps on his left thigh, and black knee-high boots with silver shin guards, black gloves remain with red insignias and finger chains, and large red wrist guards.

Diluc was once a talented knight of Ordo Favonius (aka the Knights of Favonius). It was both his and his father’s, Crepus’s, wish for Diluc to become a great knight. However, at the age of 18, he witnessed his father mortally injured by his delusion (a secondary artificial vision/power created by the Fatui in the Genshin Impact/Teyvat universe which causes immense damage to the wielder's body if used for long periods of time) backfiring while trying to protect his sons (him and his adoptive brother Kaeya) and the citizens of Mondstadt from Ursa the Drake who turned out to be ordered by the Fatui to attack, resulting in his death.

Later that day, distraught over the death of his adoptive father and his own life of secrecy, Kaeya would confess his Khaenri'ahn origins to Diluc which resulted in a fight that drove the brothers apart.

After returning to the Knights of Favonius headquarters, Diluc was ordered to cover up the fact that Ursa was repelled by his father, a citizen, an not a Knight in order to save face for Mondstadt. Disgusted at the Knights lack of respect prominent citizens of Mondstadt like his father, Diluc immediately resigned from the Knights of Favonius and surrendered his Vision.

Diluc then left Mondstadt and traveled across Teyvat searching for answers to his father's death, the origin of Delusions and a greater power to protect. On his journey Diluc would learn of the Fatui and their Harbingers and the creation of Delusions. Fueled by both anger and bitterness, Diluc pursued finding the truth of his father's death. He began to attack Fatui strongholds until he had a run-in with the Harbingers. Diluc then joined the secret organization, using the Delusion Evil Eye. He returned to Mondstadt, dealing with the Black Fire incident. After the incident was resolved, Evil Eye was sent to Dottore smashed and Kaeya returned Diluc’s vision in a vase. Now, Diluc protects Mondstadt alone as the Darknight Hero. He refuses to work with the Knight of Favonius due to his past.

To summarize, Diluc Ragnvindr hails from the noble family as the biological son of Crepus, owner of the Dawn Winery in Monstadt. He has an adoptive brother named Kaeya Alberich and their relationship was okay until their father died when Diluc was 18. The cause of his father's death is due to his delusion (a secondary artifical vision or power in the Genshin Impact universe) backfiring while defending his sons from an attack by a purple dragonic creature named Ursa the Drake. Broken by his father's death, Diluc swore to avenge him as he searched for the truth leading him to one organization behind it, the Fatui, the very same organization who created the delusion mentioned above. Diluc dedicated his life avenging his father’s death by attacking the Fatui alone when he finds some leads. He also protects his hometown of Monstadt City under the alias of the Darknight Hero (think of him as like the Batman of his hometown) while running his tavern called the Angel's Share. Diluc is a 5 star Pyro (Fire) claymore character from the Hoyoverse game Genshin Impact.