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As someone who knows nothing about Tamamo's other incarnation outside of the line in Extra where Caster describes Berserker as one of the three great monster of Japan, art of Berserker Tamamo all seems rather peculiar.
And, honestly, as cute as it is, I can't help but think it's kind of a missed opportunity. If it was more truly terrifying, it contrast better with Caster and give more credence to her backstory.