Realistic second character idea? Had plans for Green Arrow when I thought I was done with Cap, so that seems the clearest choice. Or, as I said to [@AndyC] in a PM, I think the sidekick characters make good second character types. Batgirl, Supergirl, or -- if this game was farther along timeline-wise -- my main man, Superboy.

Theoretical second character idea? Well, Spider-Man obviously, but let's face it: he'd be the primary and Cap would be the secondary there. (Sorry, Cap.) Always get excited about playing the Flash but haven't ever gotten very far with him, so that would've been another avenue to explore. Or, I could've brainstormed a Catwoman idea with [@Master Bruce] and had that on the backburner because I couldn't really see myself playing Catwoman and [i]only[/i] Catwoman. (Sorry, Selina.)

I'm sort of with [@Simple Unicycle] on the second question. I [i]do[/i] read some independent comics, but typically they're nontraditional (in the sense of most four-color comics), self-contained, or an established universe that wouldn't really jell here.