A part-human, part-monster boy. The male version of a monster girl.
Some monster girl species such as harpies or lamias can have male examples, as they might be based on the same concept but have no male equivalent word.
This does not include characters with minor non-human traits, such as animal ears, tails, horns, or wings. This also does not include demon boys or actual monsters. Monster boys typically have a human face and torso with non-human arms or legs.
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