Who was the first familiar person Victor saw after the completion of his "project"? For what reasons did this person travel to Ingolstadt?How did...

Victor, who was in pretty sad shape after first "meeting" his creation, ran into the street.  He ran into his friend, Henry Clerval, who had come to Ingolstadt to check into Victor's health and well-being.  It's ironic that they should meet in the street, but very necessary for the plot.  Victor falls into a fevor/delerium when they get back to his house.  This coincidence is critical for the plot.  If no one had found Victor, he may have wandered the streets until he died, or he may have been "captured" by the police and put into their equivalent of a mental hospital ... after all, where would you put someone who claimed to have made a human being out of spare parts that he stole from wherever he could get them? 

Henry spends the winter nursing Victor back to health.  Of course, the other irony is that, after nursing Victor back to health, he will later lose his own life because of his friendship with Victor.