I don't want to fight with any GAGers but I'll pick who I think the toughest GAGers would be in a fist-fight situation.
Guys: Me, since I'm 6'3, 259lbs (last time I weighed), a lot of muscle and I'm quick for my size. I would be surprised to see anyone here on GAG take me down. Going from visual appearance, I would say @Consultant would be my biggest challenge here.
Girls: @Bellegirl21. I mean she's an athletic gym rat, I bet she could tear some people up in a fight.
Most kids in the 20 something age group grew up behind cell phones. Most of them have never been in a street fight. No one on here seems particularly threatening. I've only seen a bunch of gym rats that like to lift bar bells (they are probably very inflexible and their joints will snap easily) and one guy that took up boxing (not treatening after the first 2 seconds). Not exactly a challenge. I'm sure there's a talented grappler of some sort hiding in the shadows but he/she isn't advertising it.
Any of the women. Whenever a guy has hit me in the past i start crying and suddenly its over and he feels like an asshole. But man when I've fought with other girls (mostly my sisters) they will just get on top of you and pound you with no mercy. And they scratch, pull hair smack punch and tears or blood will not stop the fury