One would think her appearance would be enough to discourage you. Can look like virtually anyone because of her power over shadows. A small ball of light comes from Eos's hand and enters a person's forehead. Eliminates dark energy. Powerful attack that can destroy at least a continent.
Strength depends on strength of user.
Careless at times. Insane most of the time. No sense of consequences. Mei does most things for the sake of fun and does not usually consider the consequences of her actions. Her moods tend to vary and she can be your worst enemy or your dearest friend in the span of two second.