No, not all animegao performers are male. Animegao, or "anime face," refers to a type of cosplay that involves wearing a full-head mask that completely covers the wearer's face and head, typically depicting a popular anime or manga character. The gender of the performer is not necessarily relevant to the cosplay itself. Both male and female cosplayers can participate in animegao cosplay.
It's important to note that there is no official data on the gender breakdown of animegao performers, as it is a niche hobby with a relatively small community. However, based on anecdotal evidence and observations, it appears that the majority of animegao performers are male. This is likely due to the fact that the hobby is heavily rooted in the cosplay and otaku communities, which are traditionally male-dominated. However, there are also female animegao performers, and the number of women participating in the hobby is growing.