Skydancer
Does nobody seriously not know who he is? This sort of thing is impossible to do especially in a city. There is always someone around. It’s fun but I don’t believe nobody witnesses it being done. Even in my small town someone is out and about in the early hours.
He's reputed to be rich so maybe he can afford to bribe anyone who sees him? I also find it hard to believe he's hardly ever witnessed.
I know he once 'decorated' a tube carriage with his trademark rats - public transport, so someone MUST have seen him?