Your top photo, to me, looks like a squash bug and the second is definitely an assassing bug, as it is feeding. The proboscis of the top nymph looks more thin and less like that of an assassin, though both nymphs obviously look very similar. If they are assassin bugs, they will disperse pretty soon as these lone hunters spread through your yard looking for insect prey. If they are juice suckers, then they will stay congregated on the host plants, feeding, mating, and egg laying.
Eclectic gardening style, drawing from 45 years of interest and experience. Mostly plant in raised beds and containers primarily using intensive gardening techniques.