some half assed ex boxer from milwaukee used to beat brad hefton all the time, when he was pkc hw champ.
If you're talking boxer, probably Kovalev, at least in attitude. He seems to me a guy who would trample you and then pee on your steaming corpse. GGG would at least help you to the infirmary while telling you how much he respects you.
It's Golovkin because you wouldn't think anything of him if you saw him in the street and didn't know who he was. He doesn't look physically imposing or menacing at all but he would be dropping the biggest baddest looking dudes on the streets like flies if they stepped up to him. It would be absolutely hilarious to watch a gang of toughs getting bowled over like skittles if they tried to pick a fight with him.
definitely floyd... hey if your being booooed by your own countrymen in your own country you must be very very bad!!
I think its pacquiao, or was until very recently. When you can get Floyd to be that quiet during the buildup of a fight you know there is some intimidation factor going on.