There are some anime which have all female characters, and literally, everyone that is voiced is a girl. When there is a guy, he either has a squeaky voice or is actually a girl too.
Is this because female voice actors are cheaper in Japan?
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1To clarify: are you asking why there aren't more male seiyu playing the role of males in specific anime? – Makoto Jun 20 '16 at 15:37
Nope. But it's way easier for a woman to imitate the voice of a child boy than for a man, and many anime characters are supposed to be pre-voice change.
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For more information regarding this answer, see also How common is it for men to voice women? – Aki Tanaka♦ Jun 1 '18 at 8:01
