Sherlock:
*Lots of quick frowns and glances
*Walking up to you and holding your hand
*Uses more Insults and sarcasm Than usually
*Deducing with no mercy
*If the insults and hold handing don't work,he will kiss you passionately until the man walks away

John:
*Stands there and glares at first hoping the guy gets uncomfortable and walks away
*Does practically anything to distract the man
*If none of the distractions work he'll punch them in the face

Greg:
*Comes up behind you and hugs you tightly
*if that doesn't work,he'll threaten to arrest the guy
*lastly if that fails its lights out for the other guy

Moriarty:
*makes the worlds creepiest smile,to make them uncomfortable
*making hella lot of threats
*as a last resort he'll shoot them

Mycroft:
*he'll act like he's unaffected at first
*If the guy doesn't leave quickly enough,he'll get quite possessive
*he'll call Anthea to bring the car immediately