Diluc

He has a refined and stoic personality, calm, serious and silent, but in times of crisis he can quickly become fierce, and he knows how to solve any problems that arise, regardless of their type.

Four years ago, Crepus Ragnvindr, who had somehow come into possession of a pyro deception, defended Diluc when the Fatui lured the dragon Ursa directly toward them. Crepus was able to drive Ursa away with the power of the deception, but at the cost of his own life, as it backfired and mortally wounded him. To save his father from suffering, Diluc ended his life.

Later that day, distraught over the death of his adoptive father and his own life of secrecy, Kaeya would confess his Khaenri'ah origins to Diluc, resulting in a fight that separated the brothers.

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, and not a Knight in order to save face for Mondstadt. Disgusted by the Knights' lack of respect for prominent Mondstadt citizens like his father, Diluc immediately resigned from the Knights of Favonius and surrendered his Vision.

Diluc then left Mondstadt and traveled across Teyvat in search of answers about his father's death, the origin of the deceptions, and a greater power to protect. On his journey, Diluc would learn of the Fatui and their Harbingers and the creation of the deceptions.

After four years of traveling, Diluc quietly returned to Mondstadt. Although he was no longer a Knight of Favonius, Diluc found his own way to protect Mondstadt without the need for authority or bureaucracy. After his return, rumors began to spread about a hero of the dark night defending the streets of Mondstadt from the shadows.

He likes to play chess, grape juice and art.

Despite being the owner of the vineyard, he doesn't like alcohol. He has a bad relationship with Kaeya and dislikes the Knights of Favonius. He despises the Fatui.

Born into the prosperous Ragnvindr clan, Diluc is the current owner of the Dawn Cellar and a highly esteemed noble in Mondstadt. While a past incident caused him to separate himself from the Knights of Favonius, he continues to protect Mondstadt in his own way. He is the son of the late Crepus Ragnvindr and the adoptive brother of Kaeya Alberich, cavalry captain of the Knights of Favonius, with whom he has an ongoing sibling rivalry.

Her birthday falls on April 30th, but she doesn't like to celebrate it, since on her 18th birthday her father died, so the day ended up being sad, and a constant reminder of the destruction of her family.