I started a few months ago. So I don't know alot of the older names but for certain roles:
Combat - Samantha Riggs - All Unga, All the time
Medical - Landon Seabass Hughes - Always read you a bible verse when healing you
Leadership - Carson/Windhealer/Juro - Carson is hard win/hard lose due to antics. Windhealer is a fun CO, from briefing shenanigans to leading the tribes on the ground. Juro... Banzai Bayonet charges have a place in my heart, being actually Japanese. (they only work when everyone charges regardless of death though)