Yes - two weeks running - at pretty much the same time, I saw such a character riding the same pedestrian only road in Newcastle. He spends about a third of the time with the front wheel reared up off the road - usually when he passes pedestrians.
This is it.
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I think he is likely a drug dealer. People like this don't live around here. The houses cost a million quid.
I would report it, but it would be pointless to do so.
Hopefully, during one of his rearing up manoeuvres, he will lose control and smash his brains out on a tree.
Like others of this sort that I have seen, the uniform is all black with a face mask and hoodie. An obvious criminal outlaw - brazenly advertising what he is.