Virgilia and Beatrice and Maria are all pieces, but they're also witches. "Normal witch" is never really defined, and a Voyager Witch is only a witch that maintains her power outside of her home. Erika, as a fictional entity, only exists when she's observed, so she can be both full-fledged and temporary at the same time.
Hell, the only thing that really matters is she's a Detective.
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