Okay, so with Jack, I think I may have strayed a bit too far from the original concept. I actually got the idea for him from watching clips of Arnie Pye, from The Simpsons; A disgruntled news reporter who takes to vigilantism to fix the problems he keeps having to report. But, instead of basing him off people like Henry Rollins, I think a guy like Jon Stewart would be a better mold for him.
But, as stated in the original profile; Jack is someone who values authenticity more than anything. His motivation was to inform the public; the good, the bad, the ugly, and ultimately how to protect the good, solve the bad, and cope with the ugly. But, this is a sentiment I don't think most media outlets would particularly appreciate. So, I can see Jack and Nancy being mutually antagonistic. This could also lead to a rivalry with Dale, especially since Jack tends to (try to) be better informed about things than he is.
I might also use that for something.
Another defining trait of Jack should be his immense empathy. He tends to feel for people and has a need to understand them. I didn't think to include this before, but Jack is supposed to have a teenaged son, himself. But, the model of this relationship should be directly opposite to Hank's with Bobby.
In many ways, I see Jack being almost polar opposites to Hank & Dale in particular, which is why I figured he'd be a foil for them. While, I'm not actively looking for Jack to have an antagonist relationship with the cast, I'm just working out how I see him interacting with them, realistically.
I also have an idea about introducing an antagonist or two. But, I should focus on reconstructing Jack, first.