Utsugi

Utsugi
A mysterious demon that summoned Michiru/Kaname Kururugi into the fuedal era by a ancient spell, Utsugi is a male for Michiru's storyline and a female for Kaname's storyline.

Warning! Spoilers!
If you haven't played InuYasha: Secret of the Cursed Mask, don't read this...Utsugi is really a Hitogata that is like a wooden doll demon that Kakuju created to look like his/her dead wife/husband that passed after giving birth to their child.

Kakuju used a ancient spell of shikigami to breath life into the hitogata but end up with several failures till he/she created the current Utsugi then some years passed and the villagers of the Kururugi villages started getting wise of the never aging Utsugi then they kicked him out of the village.

Then Utsugi joined up with Naraku and his incarnations to summon Michiru/Kaname Kururugi to absorb his/her soul to become human so he/she can be with Kakuju.

But in the end, Utsugi ends up gets absorbed by the completed Naraku then after Inuyasha and the others killed Naraku, Utsugi finally became a human from absorbing the soul of Kakuju that was in a necklace that he/she given to Michiru/Kaname after she/he was attacked by a gaint hitogata that killed him/her.

Attacks
Raging Flame: the basic and first shikigami attack to appear in the game that is a flame type attack that Utsugi used on Inuyasha after taking on the Wind Scar head on.

Light of Judgment: the strongest shikigami attack in the game that is a light type attack that appears as several lightning bolts coming down when a dragon of light comes up. Utsugi only uses this against Michiru but I don't know about Kaname.