guy (n.)
A guy is an ordinary word for a man or, in some uses, a person.
The word comes from Guy Fawkes. Effigies of him burned on November 5 came to be called guys. The word then spread to people who looked strange or badly dressed.12
In American English, guy became a general word for a man, and the plural guys later widened further in everyday speech.12
He seems like a nice guy.