1. Within approximation: "Mensch" works. "Comrade", if you don't mind the political connotations. "Noble" could work, but that's more directly associated with aristocracy proper as opposed to general character and less frequently used as a noun.

rm's answer also rings true, though.

2. Honestly, I think the best advice is slow down or speed up. Crossing the street preemptively strikes me as a bit patronizing.