Monica Sellers is a Krakoan mutant who has rubber-like arms that can become super stretchy but retain their hardness. In addition to that, they can also charge their arms with electricity.
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History
A version of Monica appeared in the Age of X-Man before the Earth-616 version did.
Along with two others, Liana and Josh, they snuck into Avalon as part of a dare to take a selfie on the Avalon throne. The three teenagers were caught by Monarch, the ruler of Avalon, and separated with Monica and Liana returning back to Krakoa for help.
