This going a ways back but the single person who in my opinion left the greatest mark on the NA community is
5arge of the 1stEPI. When I began playing back in Mount and Musket there was only one NA linebattle a week. It was hosted by 5arge and the 1stEPI. It was public so anybody could show up and applications weren't needed. The community was small enough back then that every active regiment could fit onto one 250 player server.
Through his dedication to his event and inclusive policies, he allowed many new regiments to flourish and become established, including my own.
If 5arge and the 1stEPI did not host this battle with the same emphasis on discipline and respect, the culture of the NA community would be very different today.
While be became less active with the release of NW, wasn't active on the forums, and never lead a regiment, I feel 5arge did more to foster and build the NA community than any player on that list including myself.
Edit: The PA hardcore LB is the direct descendent of the original Friday LB.
https://www.fsegames.eu/forum/index.php?topic=24208.0