Mirror's Wikipedia page is a stub! It says there's a superhero named Mirror in Chicago, that she showed up last year, that she is C-ranked, and that her only power is 'pushing', and has a few links to news stories about her heroically defeating supervillains. It doesn't say much else.
Minerva's Wikipedia page is, um... not a stub. Large portions of it have been broken off into their own sections. No attempt to list all of the supervillains she's heroically defeated has been made, apparently on grounds of this not really being possible to fit into a Wikipedia page, but It does include a summary of her career from the early sixties to the present, which apparently involved creating a giant army of robot duplicates of herself, then dying, then spending the next thirty-plus years sticking around as a giant army of robot duplicates of her original self saving lots and lots of lives. (Which were retroactively legally declared to be the same person as the original by a unanimous vote of Congress.) There's a lot of content and it assumes you know how superpowers work and unless it's very fascinating to Musoka she may have trouble not skimming it, though the parts involving foiling alien invasions, inventing human uploading, and overthrowing a small African country's government four times in three years are all rather eye-catching.
Doctor Dimensional has no Wikipedia page. Do you mean Doctor Devastation, Doctor Dominion, or Doctor Demolition?
The Atlantic Six are the world's most famous superhero team! The first incarnation was made up of the only American superheroes to survive WW2 (with one exception and one new member), but disbanded in 1955 thanks to half the team dying. The second incarnation was formed most of a decade later by two of the survivors, Minerva, and another three superheroes, all of whom have Wikipedia pages. They regularly cope with various possibly world-threatening emergencies, are very popular, and have an official policy of Never Talking About Politics. Current members are the Survivor of the Thirteenth, Minerva, the Smith (the second one), Paladin, Tidebringer, and Evenhand.
Octavian (real name: Octavian Jones) is not as famous as Minerva. He is the Protector of Chicago, one of the strongest heroes in the country thanks to combining high levels of both mental and physical super-speed with being an extremely strong 'brick' (very strong, very tough), apparently of the touch-telekinetic variety. He spends most of his time flying around Chicago arresting criminals and fighting supervillains. He's a member of MENSA, black, and famously abrasive, having answered a reporter who asked him if he wanted to join the Atlantic Six by saying that he wouldn't work with anyone weaker, slower, or less smart than he is, and literally everyone in the world's one of the three.
The Twentieth Century Foundation is a charitable foundation founded by Minerva for the purpose, reading between the lines, of turning the earth into Star Trek's Federation. ("Assisting with the peaceful and sustainable development of human flourishing.") They are generally in favor of less disease, war, and poverty, and in favor of more peace, prosperity, and democracy. They also like space exploration, and apparently helped fund the experimental Mars colony.