Since the Arrow-verse isn't allowed to use either Superman or Batman and Vixen has already appeared in the Arrow-verse, why not give her her own show? She can fly, she is bulletproof, she is strong and can see and hear from miles away. She can be the Arrow-verse stand-in for Superman. And she takes place in a real city so she can have some "grounded" adventures. It would complete the Arrow-verse version of the Justice League. Vixen for Superman, Green Arrow for Batman, Flash for...well, Flash. Hawkman and Hawkwoman as themselves. And the Atom. A complete Justice League right there!