While the Tohno family is a family with demon blood, Tohno Shiki's real surname is Nanaya, and he is the eldest son of the Nanaya (七夜, Nanaya?) clan, a family of powerful demon-slaying assassins, it is revealed in Kagetsu Tohya that he is the son of Nanaya Kiri.
Melty Blood and Kagetsu Tohya sports different versions of Shiki, who take the name Nanaya Shiki. They are brought out of Shiki's own fears.
In Kagetsu Tohya, he is considered the version of Shiki who never experienced death or learned the value of living. This Shiki, unlike the real one, recognizes the world around them to be just a dream.
The Melty Blood incarnation is the materialization by Walachia of the rumors of the killer that strolls at night, or alternate he is a reflection created by White Len using Shiki's unused mentality.
Character
Type: Creation
Gender: Male
Hair Color: Black
Eye Color: Blue