Answer:
What force and strength cannot get through. I, with a gentle touch, can do. Many in the street would stand. Were I not a friend at hand.
A shimmering field that reaches far. Yet it has no tracks, And is crossed without paths.
He stands beside the road. In a purple cap at tattered green cloak. Those who touch him, curse him.
Voiceless it cries, Wingless flutters, Toothless bites, Mouthless mutters. What is it?
Look into my face and I'm everybody. Scratch my back and I'm nobody.
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?