Sylph

Sylph 「シルフ Shirufu」 is the spirit of wind and serves Yuno. Sylph appears as a young female with a pair of insect-like wings. While Yuno is under the influence of elven magic, Sylph's ears become pointed. Sylph appears to be playful and free, like the wind itself. She is also shown to be quite energetic and lively. As his familiar, she's very protective and obsessive to Yuno, and would turn hostile to any girls approaching him.