The idea is that he's a mysterious phenomenon who has been around and saving people for a very long time.

so I just got hit with an idea for a novel/movie that's actually starting to sound like a really good story concept; It'd be about a man in a cab who shows up to help people go where they need to be. Now without context that just sounds like a normal cab, but let me explain: the idea is that this guy just shows up anywhere in his cab to save people. The saving he does can range from physically taking people away from dangerous situations to giving them advice that can cause them to realize something very important. The story itself would be about a female detective chasing after the man after being saved by him in the past. Was thinking about calling it something like "The Cab Driver".