regular guy
Also, regular fellow. A nice or agreeable person, as in Luke's a regular guy, or Hilda's a regular fellow. [Colloquial; first half of 1800s]
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The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
Examples from the Web for regular guy
Contemporary Examples
And Christie came across as very credible, he was at his no-b.s., regular-guy best.
His regular-guy persona flattered the élite by making them imagine they were regular guys too.