Lapis Lazuli

A Relic Eater contracted to Takeru Kusanagi. Her true classification is that of a Sacred Treasure Type Magical Heritage, Mistelteinn who was previously wielded by one of Takeru's ancestors, Mikoto Kusanagi. Unlike other magical heritages, she prefers staying in her human form.

Lapis is solely fixated on her contractor and shows no concern over anyone else unless they involve themselves with her contractor. Even if addressed, she never responded to anyone other than Takeru, but in time she came to acknowledge others but mostly because of their importance to Takeru. She speaks with a monotone and subservient voice but is known to get extremely jealous and critical of herself if Takeru were to admire or even think about using another blade. Understandably, she is very proud of her abilities as a top-class blade. She soon becomes jealous of Takeru's interactions with his teammates, often becoming silent and unresponsive if she feels that she has been ignored for too long.

(Source: AntiMagic Wiki)