Mei is a smart, off-setting, and assertive girl, often making those around her uncomfortable. She loves creating gadgets, which she refers to as her "super cute babies". Mei has a habit of "going straight to the point"[2], and is very shameless and opportunistic when it comes to advertising her inventions. While talking to people, she has a habit off getting awkwardly close to them, almost jumping into their faces, which usually causes them to back away from her.

Mei shows no fear when it comes to failing, seeing it as an opportunity to learn and do better next time, which is why she doesn't mind when her inventions fail. Mei can be seen as self-centered due to putting her love of inventions and gadgets above others, but this selfishness is not negative but rather out of motivation to improve herself.