- Official name:八舞耶倶矢
- English name:Kaguya Yamai
- Chinese name:八舞耶俱矢
- Other names:狂战士 / やまい かぐや / ベルセルク / Berserk
- Gender:Female
- Birthdate:Oct 18
- Height:157cm
- BWH:B79 / W56 / H81
『Kaguya Yamai』
Code Name: Berserk
Spirit Number: 8
Species: Spirit
BWH: 79-56-81
Height: 157 cm
Angel: Raphael
Weapon: Bow type
Astral Dress: Elohim Tzabaoth
Eye Color: Blue
Hair Color: Orange
Affiliation: Raizen High School
Occupation: Student
Rank: A-Class Spirit
Risk Factors: AAA
Spacequake: AA
Strength: 180
Consistency: 140
Spiritual power: 179
Agility: 240
Intelligence: 69
Outgoing and out-spoken, one can say that she is childish or immature. Kaguya often speaks before considering what she is talking about.
Yamai was originally one spirit, but for unknown reasons or causes that may be related with her coming and going between the dimensions sometime in the past; she was split into two bodies and mind. The original personality of Yamai is no more, as well as what type of personality she used to have is unknown to the split Yamais. The Yamai Sisters have been well known to the people who know about the existence of spirit because they often cause major storm in the area every time they come through to Earth.