I sort of saw Owen's death as karma - you die, you think about everything you've done, and now you have to live with that knowledge. I have another ranty ramble about selfishness and selflessness in Torchwood to do (I really need to stop doing them out loud whilst walking home from the shops. I get all sorts of funny looks), but I think that his death is an example of selfishness being punished.

Tanizaki is a weird one for me, because it depends on why he had all that knowledge. The way he looked at Lisa, I always got the idea that he was another Lumic, but a few steps behind.

Gwen is either a Mary Sue or a self-insert. Even if she isn't, the fact that he doesn't seem to see anything wrong with her actions is enough to make me judge him. I know we accept that the characters' views are not those of their creator, but when he talks about that character as a moral compass, and an essentially good person, and she's... Gwen... Ugh.