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Greta was one of the many gremlins that invaded the Clamp Center building and she was also the first female gremlin. She is technically harmless, but her affinity for some men is quite troublesome. Greta is in love with Forster and has a bit of a dislike for George. She is also the sole surviving gremlin after all of her fellow gremlins are killed.
- Greta appears in Demiguise Double-Cross as a summoned character through the Locate Keystone.