Originally thought both Doug and Carrie were ESTP, but in an earlier post from way back someone said ISFP for Doug and ESTJ for Carrie, and it made sense too.
I saw Deacon as an ISxJ, and Kelly as an ISFJ. Arthur baffled me at first thought, but I'd say ENTP. He loves to argue for argument's sake, and if Doug is ISFP, Arthur's ENTP could make him the "conflict" type which makes for some humorous interactions between the two.
A hero is someone who does the right thing without expectation of reward, just because it's the right thing to do.