Here's session 1 for the series I'm calling Legacy, featuring Advance and PowerStar. As has been suggested before, you can now see the entire organization and prep process by following the tag, leading into play that you can see here.
The whole session plays nicely off their respective defining features, in that Advance is a sixty-year-old man who involuntarily retired from superheroing, and is now unexpectedly restored into that role, plus everyone knows it's him; and PowerStar is a thirty-year-old restauranteur who's suddenly become the wealthy inheritor of the long-gone original and widely-believed best superhero, and no one knows it's just him.
This session especially, satisfied a need that I didn't even realize I had, to celebrate the 80s comics and general culture without sentimentalizing it. It's not retro, being set in the here-and-now, but the heroes are heavily historically oriented and my ... interesting choice about what to do with that turned out historically more powerful than gimmicky. Deliberate 80s stuff won't be a characterizing feature of the whole series, but it surprised me how fun it was as a single event.
I'd like you to examine how we arrived at all the visible content - and there's a lot - by allowing independent work off the two statements, then meeting to help with the three-cornered process and any mechanics clarifications. We specifically did not discuss ideas and possibilities, or vet one anothers proposals, before putting down at least half-a-character.
I'll talk more about the GM prep process in the comments. It'd be good for you to see how I played the NPCs first.
I screwed up one thing out of the gate, which is that play was supposed to begin with Mike (PowerStar) interacting with one of his close family, either his brother, or his sister-in-law, who happens to be his ex and now runs the restaurant. That leaves us (the group, or anyone viewing, probably) more emotionally connected with Advance, but then again, the final interactions between the heroes bring out so much that I can't imagine the session being any other way.
I think you'll enjoy it. We really did.