Sally
The girl working in the diner as waitress which is visited by John, the alien. Only she understands how John can make a difference on the earth.
John
The alien that enters the diner and orders food. He remains polite even when Charlie, the diner’s owner showed hostility towards him.
Charlie
The diner’s owner, who lost his cool when alien ordered food at his diner and started being rude towards him. John, the alien, still remained polite and left the diner without saying a word to Charlie.
The Old Couple
This old couple was eating at the diner and tried to leave without paying the check. This scenario contrasts the humans' maliciousness with the alien's kindness.
The government officials
The government officials escorted the alien out of the diner even though he did nothing wrong.