I tell them apart by the weapon bags they carry
Although there's this one guy I keep seeing who might be carrying either a naginata or a fishing rod... Might ask him some day.
But the other day I noticed this guy and knew right away that he does some sort of meditation or exercise from they way he sat. He was also a vegetarian. Turns out he was a yoga teacher.
Talking about people who always stand in hanmi, I read somewhere that Takeda Sokaku always stood in hanmi...