Eucliwood Hellscythe  

Eu, Neckwear-Mancer, Yuu, ユークリウッド・ヘルサイズ

Eucliwood, or Yuu for short, is a necromancer who revived Ayumu to serve as his guardian. She wears armor that restrains her powers and doesn't speak because her words can turn into reality. Instead of talking, she communicates through notes about her appetite. Despite appearing emotionless and silent, Eucliwood deeply cares for her friends and others, including Ayumu, whom she considers a servant. She takes the word "death" seriously since her abilities can instantly end someone's life. Ayumu often imagines Eucliwood speaking in a cute manner.