Great responses, James. I think adding a quirk does help humanize types and gives them more of a sense of roundedness or “realness.”
I like the idea of distinguishing between “seems to be” and “is.” As we learn more about the character, our perspective on them changes. Those kinds of characterizations can be hard to do well but they are very engaging for readers.
About “getting past” conflicts: Someone mentioned to me a conflict in a story that was basically “you might be my brother” and . . . that’s not a romance conflict. I mean, you don’t “get past” that. The characters either are related or they aren’t, and no “change” in their goals, decisions, and motivations makes any difference in overcoming that, uh, challenge. Also, ew.