i would like to mention:
plantex, excellent barb and conju, he have been teaching me about all classes and all kind of fights in all my 9 months of RO.
bocinha, aswell learning things from planetx, made me know alot of locks and barbs
hephaestus: with his amount of videos and game coments, u can learn alot about everything with rapid observation of his game behavior
king alexander (dont know his name after the server merge): this guy killing me millions of times on horus made me learn a bit of how to gank ppl and lot of hunter gameplay, hes seems dont be afraid of hunting alone, what is imo a very good thing.
mitsaras: dont know him well, but u can see big changes on realm behaviour when his around. hes, also, always patient to talk to noobs like me and boci
ignis have alot of remarkable ppl, but my memory goes bad and i wont mention any1 more here