I feel like I should make a list on here, as many of my good friends have barely been mentioned, or not mentioned at all. It probabl7 has something to do with the fact that I'm only level 52, and thus haven't met many of the higher level players yet. However, I have met a few that helped me through those low levels. Here they are:
Oneiza and Rixosa - I met these people when I was level 10, doing Bastok 1-1. This was my first party experience and it totally hooked me on this game. I rarely see them anymore, but Oneiza did help me with Rank 4 several months later. I wish I could play with you guys more often.
Chong - Helped me with Kazham keys, even though he was only level 35 or so and in Mining Gear at Palborough. I've gotten a great deal of advice from him over time.
Topcat - I met her in Gusgen a few months ago while mining. We started discussing mining and other things and became pretty good friends (although some in my linkshell are in the rival HNM group). She went with me to CN as a 73 RNG/NIN and soloed my Exoray Mold for free (I still bought her a stack of Shihei anyway).
I've also met plenty of people around my level who have become friends of mine, outside of my linkshell.
Tpolom - I met him in the mines, and have since XPed and done Promyvion with him. Cool guy to play with for sure.
Tusochiso - He plays a little less than many, but I try to seek him out whenever he is on. I don't remember exactly where we met, but I do remember that he was so kind as to sell me an Astral Ring at a sizeable discount. I still haven't been able to give him back anything like the deal he gave me.
Vantol - An avid crafter from the Netherlands that I attempted to start a HighQuality chapter with a few months ago. He was great to play with on those days off from school, when none of my other friends were on.
Of course, there's my linkshell too, who is one of the best groups of people I have met. It's been through some problems, but has managed to stick together after nearly a year.
Katie - The leader, and a person whom certainly has not made this list yet. However, after getting to know him, he's a great guy to play with. I have completed many quests with him, and he has helped me with numerous trials, such as 2-3, Rank 5, and the Papyrus.
Duncan - Duncan used to help anyone who needed it every Monday night. Now he helps out even more than that. I've been PLed and teleported by him many times, and he was also part of that Papyrus party (along with a few others from the LS).
Urntan - An older player and a **** of a guy, Urntan was always willing to help, even though his characters were a bit low. I've partied with him a few times and took him through Davoi once, back when we were both level 30. It's too bad he hasn't been around for over a month.
Bobbyray, Beclebond, Betadur - I always get you three mixed up, because you're so close to each other on the LS list ^^. I've definitely had a good time doing something with each of you, though I can't remember what is what.
Tatto - We've done multiple Promyvions together at this point, although I haven't been in his party yet. Regardless, great guy in general.
Shaqswede - I haven't gotten to play with him much, but he did get me an Ordelle's chest key for RSE not too long back. I hope we can PT together soon (my DRG is finally high enough).
To quickly round up the rest of the LS, there's Pakun, Scipoi, Plater, Fearme, and a host of others I can't remember right now. DragonArmy is awesome, and I hope we can keep it together forever.