In Overwatch, Tracer (real name Lena Oxton) is a young ace pilot from the UK. When a flight experiment goes wrong, her molecules become desynchronized from the flow of time. Fortunately, Winston designs a device that anchors her to the present and even gives her the power to control her own time.
In Team Fortress 2, the Scout is your typical messenger: quick, snarky, and a lot tougher than he appears. He likes to inflict damage with his baseball bat and escape before the opponent knows what hit him.