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Character:

Elfleda is also part of Lotte's female-only staff. She is very notable for her very huge chest, which even made Naoya blush at first. Effie is also one of Lotte's confidantes, the other one being Griselda. Effie hails from a noble race with traits similar to cows, therefore being able to produce high-quality milk, albeit through her huge chest. Effie also wears a bell around her neck, another trait of cows. Effie is generally nice, but can be slightly perverted at times, and is easily embarrassed around Naoya at first. Effie is usually seen together with Griselda or Judit, watching over the princess, Asuha, and Naoya.

Source from Wikipeida