Nam Repus and Ukog. Huh? Is this too much of a rip-off of Superman and Goku? Could I get sued?

I want to have an evil version of Superman and Goku get defeated by "Team Gamma" in one of my stories. Nam Repus would be evil superman and Ukog would obviously be evil Goku. Am I allowed to do this, or is it a copyright violation to use these fictional villains?

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Nam Repus comes from the planet Argon, and Ukog claims to be "A God," but will be shown to be mortal after all.
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quora's bot advises me NOT to do this, even with the names spelled backwards. It says it could still be considered copyright infringement.
Nam Repus and Ukog. Huh? Is this too much of a rip-off of Superman and Goku? Could I get sued?
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