First guy who wear peasant clothes and a stick was first peasant in game. Dont know who it was but probably not Testicles as at that time that Testicles probably didnt even know about MB at all. Talking about trends... using peasant gear as basis you can say thanks to the first leecher probably....Maybe Herkutatti_The_leecher? :p
The fact that in Eu the game was played for like a whole year without Na servers to play on, could be enough for you all to realize that everything was done before it was done on Na side.Sorry to dissapoint you. Could have been the other way around, (if mod started with Na servers obviously,its nothing special), but it wasnt like that. Another fact to consider its first na players started playing at Eu servers, where they could catch some influences on what to use or not,but definitely they didnt start from nothing.
About specific "who started this trend on NA", probably kesh post its the most correct of all.