Мей-Лін

The glasses-wearing maid of the Phantomhive household. Mey-Rin is enthusiastic about her job but extremely bad at it (her main fault being clumsy.) She adds too much soap while washing clothes, trips and shatters the good china, and is generally a gigantic klutz. When asked to do an important task, she stutters and panics, which only adds to her natural clumsiness. She owns a pair of glasses that do nothing to improve her clumsiness. However, she refuses to purchase a new pair as they are the first thing Ciel bought for her.

It's implied that she has a crush on Sebastian as she is even clumsier when Sebastian is watching.