Looking through everything added in this thread since update #3... it still seems a little lacking, story-wise.
Bowman III has been an archer/athlete all his life. He used to be the leader of a teen hero group, now he's in the Freedom League. But there's literally nothing else to him. (Incidentally, the whole Kickstarter update can be found on the Obsidian Portal character sheet and bio, so we can persumably read up on all the other heroes there as well.) However, we do get an idea of his mechanics from the Atomic Think Tank page, basically, gimmick arrows a la the comic book Green Arrow or the MCU Hawkeye.
Captain Thunder is apparently a statesman, despite being "Captain Thunder" full time, and a "family hero" similar to Legacy. I'm satisfied with the amount of background put into him. Mechanics will be tough, though.
Daedalus actually has a really thorough story. No complaints there at all. Mechanically, in addition to protection and strength, the suit comes with gravity-controlling powers and vision enhancements that let him see things on the atomic level and see through solid objects. Gold standard stuff here.
Dr. Metropolis is also all mechanics and no background/personality, he just sort of showed up one day and does what he does. The Atomic Think Tank character sheet even goes so far as to have him be severely weakened and eventually die outside a city. He's going to be a serious design challenge. Good luck Christopher!
Johnny Rocket: Another career superhero with no background or personality besides "fast" and the fact that he's gay. Yawn. He does seem to have some abilities centered around creating wind flow (e.g. tornadoes) with his speed, which will be a nice hook for Christopher.
Lady Liberty: Was in pre-law. Other than being very patriotic, that's pretty much all there is to know about her as a person. Power-wise, though, she has some potential: in addition to the usual flight and strength, she has healing powers and apparently some firework/explosion stuff. I guess she's probably the one Christopher mentioned in the podcast as having a shield that isn't documented anywhere.
Pseudo has a pretty thorough background, too. Good stuff on the Atomic page. Christopher will have both some espionage (mind-reading and becoming insubstanial) and shapechanging abilities to work with.
Siren is basically like Ra. Lots to work with here.
Star Knight: A former cop. Backstory is essentially a cross between the Green Lantern and agent J from Men in Black. I don't have a good feel for her abilities other than armor, flight, and an energy sword.
The Raven: Yet another career superhero with not much else in the way of background. She's basically the daughter of Batman, trained to be just like him. Making her different from Wraith is going to be a serious design challenge.
So to sum up, we have 5 heroes who are plain-vanilla and have not much background or life outside of being a superhero, two or three that are OK, and two or three that are pretty good. Mechanically, we have four or five that will be tough to make interesting, four or five that have some clear potential, and one that will undoubtedly be interesting but will be hard to reconcile with the lore in a way that makes sense and is fun.