A "good fellow" is a kind, good-natured person, often a man, who is friendly and dependable. The phrase praises character and spirit, not status or skill. It can sound warm, informal, or slightly old-fashioned.
Marconi is a good fellow. Let him continue. He is using seventeen of my patents. Nikola Tesla
The musical comedies of the month are She's a Good Fellow and The Lady in Red, both of which owe their book and lyrics to Anne Caldwell-evidently a native of New York, judged by the casualness with which she rhymes "teacher” and "reach a.”. Dorothy Parker
Yes. He is quite a good fellow - nobody's enemy but his own. Charles Dickens
Our guide, a fisherman. A good fellow." "He doesn't hate us?" "Hate us?" "I keep being told how the Spanish hate us, sir." "He hates the French, like I do, Sharpe. If there is one constancy in this vale of tears, it is always hate the damned French, always. Bernard Cornwell
A good fellow tint never, but at an ill fellows hand. Scottish Proverb
The good fellow to everyone is a good friend to no one. Jewish Proverb