As Jadyne stated a few pages ago, there's just too many people and so much time has passed to possibly remember them all.
When I first got into twinks I created a 19 twink guild and had recruited nearly every 19 on my server at the time except this one guy that refused to join and made his own guild. I ended up making the decision of merging with his guild and it was something that really kicked off not only the activity on our server but probably my career start with twinks. I can't remember the guys name for the life of me, literally right at the tip of my tongue. It's been so long.
I remember when I played 29's, I would theory craft with my pal Kuntekinte almost daily (known here as Idiote) and I'd say he's made me a better arena player for sure. My biggest mentor is my long time friend Entrerri, he's definitely made me a better player; great guy. He's who encouraged me to stick to playing Rogue when I played 29s and when I moved onto 39s.
Someone I really looked up to was Brumble. He was one of the most exceptional players of the 39's bracket and the nicest guy I've met playing this game. We would duel for hours outside Ironforge everyday, discuss addons, macros; some in which you could most likely only find from him because of the intricacy he put into them and all which I still use today. He taught me so many things that were outside the current meta and overall made me excel further as a player.