But I think that you're missing a third option - Klara interacting with all the history she missed out on. There could be a stand-alone issue where Klara goes to a history museum, or maybe talks to a World War 2 vet - hell, she could be talking to Steve Rodgers or Bucky Barnes. It would be a nice dynamic between what is so new for Klara is so old for everybody else ("World War Two? Just how many world wars did you have?!").

And while it's a good point about the fact that Klara would most likely keep those thoughts bottled in, I disagree that Wheadon did anything to resolve it - he established it, sure, but he didn't really "deal" with it, and I highly doubt that just because she decided to go with them means she "got over it." I think you can get a pretty good story arc out of Klara's homophobia, and how she does deal with it. It could go like that one episode in Gargoyles, where the Big Bad Demona is all "Humans are bastards, and I want to talk to your leader so I can convince him of that" only it turns out that by "talk", she meant "cast a spell to control his mind so that he has to agree with me."

Other than that, all the other insight about Klara being the most responsible one despite also being one of the youngest? Totally agreed.