Sporting News did this last year:
http://www.sportingnews.com/mlb/story/2013-09-17/most-beloved-baseball-players-team-by-team/Their picks:
AL EAST
Baltimore - Cal Ripken
Boston - Johnny Pesky
New York - Yogi Berra
Tampa Bay - Evan Longoria
Toronto - Robbie Alomar
AL CENTRAL
Chicago - Frank Thomas
Cleveland - Bob Feller
Detroit - Al Kaline
Kansas City - George Brett.
Minnesota - Kirby Puckett
AL WEST
Angels - Tim Salmon
Houston - Biggio
Oakland - Rickey Henderson.
Seattle - Edgar Martinez
Texas - Pudge Rodriguez.
NL EAST
Atlanta - Dale Murphy
Florida - Jeff Conine
Mets - Tom Seaver
Philadelphia - Richie Ashburn
Washington - Ryan Zimmerman
NL CENTRAL
Chicago - Ron Santo
Cincinnati - Pete Rose
Milwaukee - Robin Yount
Pittsburgh - Roberto Clemente
St. Louis - Stan Musial
NL WEST
Arizona - Luis Gonzalez
Colorado - Todd Helton
Los Angeles - Fernando Valenzuela
San Diego - Tony Gwynn.
San Francisco - Willie Mays
MY FAVORITES
AL EAST
Baltimore - Cal Ripken
Boston - Wade Boggs
New York - Goose Gossage
Tampa Bay - The Crime Dog
Toronto - Close between Olerud and Carter...gonna go Carter as KC guy.
AL CENTRAL
Chicago - "Black Jack" McDowell
Cleveland - Sandy Alomar
Detroit - Cecil Fielder
Kansas City - George Brett. Besides him? Sabes and Quiz and Willie.
Minnesota - Walter Johnson

AL WEST
Angels - Vlad
Houston - Bagwell
Oakland - Canseco
Seattle - Junior
Texas - Pudge
NL EAST
Atlanta - Glavine
Florida - Conine
Mets - Dwight Gooden
Philadelphia - Kruk
Washington - Pedro Martinez

NL CENTRAL
Chicago - Kerry Wood
Cincinnati - Pete Rose
Milwaukee - Robin Yount
Pittsburgh - Tim Wakefield
St. Louis - Joaquin Andujar (heh)
NL WEST
Arizona - Big Unit
Colorado - The Big Cat
Los Angeles - Orel Hershiser
San Diego - Tony Gwynn.
San Francisco - Will Clark