The Special skill description for Namahage is incorrect
“The caster gets +34% attack, and a further 18% increase every time they are hit during 5 turns”
Should be “The caster gets +34% attack, and a further 18% increase every time he is hit during 5 turns”
The third-person plural subject pronoun is now often used in English as a gender-neutral singular subject pronoun. So the English text is almost certainly how SG intended it to be.