Medical officer on board the Cha-Cha Maru, Mei Lin Jones is charged with the health of the crew. The medical talents of this stunning beauty is tested to the limit, especially when Tita is gravely injured at the hands of Guizel.

In the manga, Mei is depicted as a sister figure to Tita; Tita was raised as part of Mei's family after her father died. It is also revealed that Mei once saved Tita's life when Tita was suffering from a deadly disease called 'Ietta Fever.'

Source: Wikipedia