Role
Mei Lia is the Chief Mechanic for Taskforce Root of Spring, and as such it is her job to keep them all its vessels in tip-top condition. Her other main job is to provide comic relief, usually in the form of verbal sparring with Terra Olvido, and provide technical info about PLANT and BTS systems.
Personality
Her detractors would say that fixing robots is the only thing she can really do, as she's not the most socially adept of people. She loves giant robots, and she also loves to talk about them, freely mixing in jargon and advanced concepts in conversations about, say, the weather. Mei Lia is airheaded, but not quite the same way Siela is—if Siela is too absentminded, then Mei Lia is too focused.