Mei is a reasonably short girl with quite a mature build. She has salmon pink hair, which is generally shoulder-length, although it does vary, which is styled into thick dreadlocks and side-swept to her right. Her eyes are wide and sloped upwards with some notably long upper eyelashes, their irises green-yellow with a cross in the center, making them look somewhat like scope lenses.

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" and is very shameless and opportunistic when it comes to advertising her inventions. While talking to people, she has a habit of getting awkwardly close to them, which usually causes them to back away from her, but she still moves up to them. She can also be manipulative, as she tricked Tenya Ida into using her support equipment to promote her inventions.

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 does not 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 a negative as it is out of motivation to improve herself. She does seem to be a little bit absent-minded as she is easily distracted and can sometimes be completely unaware of her surroundings.

Mei's Quirk allows her to make her vision zoom in on whatever is in her line of sight. If she really focuses, Mei can see things as far as five kilometers.

She's seen wearing a plain black tank top with workshop coveralls tied casually around her waist, with some goggles on her head.

She is somehow able to get into the most awkward positions by accident and literally not care.