Fighters known for their guard

I mean, you can be both -- the "money" version of Floyd Mayweather. Didn't want to get hit, but counterpunching often was his offense.

 

Jorge Castro's patented "guard by no guard" defense.

 

Fullmer maybe

 

Dwight Muhammad Qawi was a 5'6" light heavyweight champion. To do that he employed quite advanced head movement, 3 types of guards, The high guard, the cross guard and the philly shell mixed in with bobbing and weaving and dipping below his opponents waist.