Yukon Jack to me is boredom wrapped in a cliche and tied with a stereotype. He's from a lost society in Canada, and wears only a loincloth. Isn't it kind of cold for that? (I am well aware that most of Canada is well outside the arctic circle, so please don't blast me for a "stereotype" of Canadian weather. For the society to have remained hidden it has to be a bit further North from the border with the US, and it might have been better to just have had him from another dimension. His mannerisms and especially his speech really turn me off. I don't think he hasn't had much characterization, but what has been shown hasn't grabbed me.
Puck2 also doesn't interest me. MMJr was right in a lack of motivation for her, although the bet gets her involved in the first arc and a possible attraction to Walt can theoretically keep her around. She's interesting to me only in the sense of how her presence can impact the real Puck (who is much like corn flakes in the sense of "original and best." With Puck gone now, his daughter can't bring that impact. This formula is just like TV soaps, where the newer characters need to prove themselves with impact the existing cast before people can attach to them. I also HATE her costume. Yes, very hip and fasionable and sexually alluring, but who would wear loose pants into combat, ESPECIALLY ESPECIALLY ESPECIALLY if she is an acrobat who needs a full range of movement?
Sir John's argument of solid characterization in 6 issues could have easily used AFv1 as an excellent example, and for that matter, v2. Radius and Flex and the other Hull kids weren't among my favorites (maybe also because they were displacing known and loved characters in an "AF" title) but by the end of the 6th issue, there was a good feel for who they were, why they were, what they could do.