So, to create James, I took a leather jacket upper body, grey leggings, the head from a Scott Lang minifig (it's the closest flesh tone face I have to James' face), and a ginger hair piece from a Speed Champions racer, and this is the result
In all honesty, I would LOVE to make Jason and Kit as minifigs, but there aren't any good parts for the two (there's no good... anything for Jason; since Lego refuses to make anything military, I'd have to buy his parts from an aftermarket shop, and Lego doesn't even MAKE any figure hair that remotely resemble Kit's hair)