Welcome to the forum, or at least to posting on it.
Statting low-end mortals is pretty easy. Just pick skills, maybe a stunt or two, and you're done. Well, apart from Aspects.
Let's take the first character on your list. The good-natured jock. Jock implies that his top skill is Athletics, and that he's decent at Might and Endurance too. Good-natured implies decent Rapport, Empathy, and Presence.
As it happens, six skills is the exact right number for a 10-point pyramid. So our jock can look like this:
Good Athletics
Fair Might and Rapport
Average Presence, Endurance, and Empathy
He doesn't really need any stunts. But maybe something for his sport of choice would be appropriate. And if there's gonna be fighting in the game, maybe he should be able to do that. So how about...
Star Pitcher: May use Athletics instead of Weapons to throw things.
Pretty Good Batter, Too: May use Athletics instead of Weapons to swing around a baseball bat.
Not sure how clear the underlying approach is here...do you see what I'm doing? In any case, something similar should work for the others too.
PS: There are some minor balance concerns with a stunt that moves attacks to Athletics, but for a one-shot with no Speed powers involved it really doesn't matter. And anyway, he's basically spending two stunts. Which addresses that issue pretty handily.
