There are all different types of crossing guards. Some are very friendly, and get to know the kids they see on a regular basis, then there are those that just do the job of crossing the kid. Then there are those that are really into their job and direct traffic in addition to crossing the kid.
As a side point, one thing I noticed is that all the crossing guards I know have blond hair.
The crossing guard by HS was really into her job, she would cross those that got off the city bus to the block of the school. It was a big street with cars always turning from a six lane highway into a 2 lane street. When the light was flashing and it was about to become green for the cars, she would tell us to wait and not cross the street. But there were always those girls who wanted to run across the street anyways, and she would give them an admonishing look.
The bus stop of the triplets that I babysit for are next to a public school, so there are crossing guards on both corners. One is very quiet, and just sees a kid coming and starts walking in the street with him. Then the other one is so friendly, she talks to the kids asking them how their day was, if she notices something in their hand she'll ask about it.
In either case, I always thought crossing guards had such an easy job, that they barely do anything. But now I realize in the winter its the hardest to have to stay outside in the freezing cold. Now that I know what its like from waiting by the bust stop for like a half hour or 45 minutes sometimes, I see its not such an easy job after all.