List of characters with the power to determine what powers other characters may possess, track the movements of superpowered individuals, or just simply determine if another individual has powers (without necessarily knowing what those powers actually are).
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- Caliban (Earth-295)
- Caliban (Earth-616)
- Caliban (Earth-11052)
- Caliban (Earth-58163)
- Caliban (Earth-91240)
- Caliban (Earth-TRN064)
- Callisto (Earth-10005)
- Cerebra (A.I.) (Earth-616)
- Cerebra (Mutant Detector)
- Cerebrax (Earth-616)
- Cerebro (Earth-10102)
- Cerebro (Founder) (Earth-616)
- Claudette and Nicole St. Croix (Earth-295)
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