Identify a small bug, possibly a plant bug?
This is a plant bug (family Miridae); going deeper isn't possible on the basis of a photograph, except for some common economic species (the key to genera in How To Know the True Bugs is almost 200 couplets long!).  Most species of the family are plant feeders (hence the common name); biting humans is unlikely.

Reasoning (from Comments):

The top right photo [from the OP's post] shows that the front wing has a cuneus (a section of the hardened part of the wing on the outer margin set off by a groove), which is characteristic of that family and the broad-sense "Anthocoridae" (which includes three smaller families); none of the photos show simple eyes (the eyes we see are compound), which eliminates "Anthocoridae" and the subfamily Isometopinae of Miridae; the remaining seven Nearctic subfamilies are still possible