Ple-Sen
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In certain genres, such as shojo or maho-shojo, there are more female protagonists. That is, either in something aimed at a female audience, or in something where a predominantly female cast is determined by the genre's specifics. Similarly, there are genres like shonen, in relation to which Ment's statement is quite accurate. In more neutral genres, the situation is more balanced, but I would still say that there is a bias towards male protagonists.