Kenos

Name: Kenos // Spelling: κενός // Meaning: Void

Age: Unknown // appears 14 // When his power is unsealed, he appears 28

Yuki Kaneshiro's ancestor 

Kenos is two-faced and will not hesitate to stab someone in the back

He only cares about his wants and needs

Seductive/Can charm the pants off of anyone

He is cold and calculating

He will not hesitate to kill someone if they annoy him or if he no longer has a use for them