Luka Crosszeria

Is a high-ranking Duras(demon) who has been protecting Yuki from the shadows ever since his birth 15 years ago

Luka has pale, transparent skin, medium-length black hair and silvery eyes

He often dresses in a black coat and has a black cross around his neck, which was made and given to him by Yuki.

* His two earrings are rather important. The fang-shaped one on the top has Sodom and Roxass (his sword) sealed within it.
The one on the side is an ability controlling earring and is engraved with a control spell

* Luka's lucky charm (a black cross) made for him by Yuki has a different design from all the others, making it particularly special to Luka.

* He is said to have a sweet scent and always smells good.

* He can change the length of his fingernails to extend to four inches long.

Sodom
Is Luka's powerful dragon familiar. His true form is a huge dragon, but usually, he is in a chibi "energy-saving" form and later he appears in a human form sometimes. He can also appears in a wolf form.
He is very loyal towards Luka, having no problems attacking even his own brother, Gomorrah, (who happens to be Luze's familiar.) if Luka so orders. It may not seem like it, but Luka truly cares for Sodom as he is seen by Yuki watching over Sodom as he plays with a butterfly.

Relationships

Yuki Giou

Luka is completely dedicated to Yuki considering him more important than anything else in the world. In Yuki’s previous life, she was a woman named Yuzuki and they fell in love which caused Luka to defect from the Demon King and ally himself with the Giou Clan. He won't tell Yuki of their previous relationship because he believes Yuki wants to forget everything from his past life due to Yuki being reborn as a boy for the first time, as all of his previous reincarnations were previously girls. Luka promises he will stay with Yuki as long as Yuki wants to