Woman in Red
By day a mild-mannered policewoman, at night she solves crimes.
Her powers include deductive reasoning, athletic prowess, and a willingness to brandish her gun.
Give her a red fedora and she's the anti-Carmen Sandiego
>>1045531
The characters as depicted in their unmodified state are public domain.
DC owns Captain Marvel but he's legally distinct from the Fawcett-verse version by virtue of the world he inhabits.
A similar story with Plastic Man, who was originally published by Quality Comics.
Archie's a trickier issue as he's technically the same character in roughly the same world. You'll note on his PDSH page that it's the version in Pep Comics that's public domain.
As for Felix, yeah, he's damn near fully public domain.