One common theme could be adventure. Given the DC universe setting, stories might involve Ben Turner and Vixen going on various exciting quests. Another theme could be the exploration of their powers and how they interact with each other in different situations.
No, they're not exactly the same. DC Comics is the original source of the characters and stories, while the DC Universe is a broader platform that includes various media adaptations and related content.
In DC Comics, 'DC' stands for Detective Comics. It was originally the name of a comic book series that later became the basis for the entire DC universe.
DC Shoes and DC Comics have no direct connection. DC Comics is famous for superhero stories, while DC Shoes focuses on producing shoes and related apparel. There's no ownership or business link between them.
I don't think Vixen dated John Stewart in the comics. The comic plots didn't show such a romantic connection between them. Maybe in some alternate universes or fan-made stories, but not in the mainstream comic canon.
DC Comics has indeed been bought. The acquisitions are part of the dynamic landscape of the entertainment industry, where companies seek to consolidate and grow their presence in the comic book and related media markets.
It's hard to say for sure. DC Comics has had its moments of being number 1 in different metrics, but the comic industry is highly competitive and the top spot changes frequently based on multiple elements.