My nominations for outstanding players are very personal, and have more to do with personality than playing style.
Ixora - The best Ninja I have met. But more than that, one of the gentlest souls I have ever had the pleasure to know. Always ready to help anyone at the drop of a hat, and yet was able to level multiple jobs into the 60s. I was fortunate enough to have partied with Ix many times, and it was always great fun. Sadly Ixora left the game on Jan 31st. She will be greatly missed.
Enzouryuu - A quick witted and funny red mage, I have not yet had the chance to party with Enzo. Hopefully someday soon. Enzo also helped me greatly when I got stuck leveling white mage.
Trench - An impressive Galka paladin, and a good friend. I laughed til I had tears in my eyes the first time I saw his "Behold the power of cheese" WS macro. Whenever I do a mis-tell I think of Trench. He left the game in November of last year, and is also greatly missed.
Himura - An excellent ranger. I partied with him in the dunes at level 17. He was ranger and I was summoner. His ranger is now 73, and my summoner is still only 19. Go Himura!
Ralli - Excellent all around player. He helped Argent and me get our Kazham keys what seems like 100 years ago. I've had the pleasure of partying with his white mage, black mage and summoner. He does them all well. I hear he's a pretty good dark knight too.
Argent - As fine a red mage as one could hope to know, and an even better friend. We met as newbs in the dunes, and have been playing together closely ever since. I simply don't have the words to describe what his friendship means to me.
Others come to mind, many of whom have left the game: Alexel, Arcangel, Azryel, Azryanka, Clist, Craubaud, Demonhunter, Lilhawke, Katja, Leed, Leonhart, Leyakit, Nabella, Onionfire, Pakkratt, Tarumart, and more...