I'm probably gonna redesign Nuclear (The silver girl one) one last time but to explain somethings, it's about a giant mech and NOT-Astroboy siblings defending their City from an Alien invasion
Colbat Cassie is the Alien Leaders nano machine daughter

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has gone through multiple redesigns.
This concept takes place in the future where a capital City is under constant threat of monsters of all sizes, so a genius scientist creates a robot running on an atom and a robot running on nuclear energy (1)

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