I think its time for me to update this a bit...since I've met a lot of nice people recently. So, I'll take my old list, and add to it.
Goero: Got me into a LS that I actually feel comfortable in and fit in with.
Shienn: Helped me to Jeuno way back when and has helped me with numerous things since then.
Cyna: A wonderful PLD and good friend, too.
Celestra: The best WHM I have ever partied with. Her small size (Taru) betrays the fact that she has a big heart.
Viv: One of my first party experiences in the game, way back when, was made most memorable by her presense.
Dunrick: Good BRD and great guy. He helped me with my AF1 and I'm very appreciative to him for that. (I don't think he plays any more.)
Vein: Don't know him that well, but he helped us with getting our Papyrus and stuck around to the end to make sure we all got what we needed.
Kaiya: I met her through Cyna, and she helped out with my Exoray Mold and Bomb Coal. She's a great person and a good WHM.
Raiine: My best memory of my first time through Valkrum was in his party. It was a lot of fun. Also helped me through Rangemont Pass when I was trying to get my SMN quest done and helped me get my Eldieme and Oztroja coffer keys.
Raevenx: See what I wrote about Raiine, 'cause she was there too. :)
Jess: Again, another leader in one of my best parties plowing through the dunes my first time. He kept everyone in good spirits even though we ran into some trouble at times. (I don't think he plays anymore.)
Dymitri: Only partied with him once, but it was a fun time.
Xayla: Dymitri's other half. She's great at organizing Bard concerts by the AH in South Sandy. :) (Inside joke, you probably wouldn't get it...lol.)
Neoyosho: Always willing to help out whenever its needed.
Fernier: Offered many times to help out with my AF coffer keys and just a nice guy.
Weedjedi (dunno his new name): Helped us out in an alliance to get coffer keys in Eldieme. No matter what happened he was always joking about it. I wish I could remember the name of the higher-level DRK that helped us out too. He died pretty fast when he pulled aggro during a battle with a Spriggan and just laughed about it, even though we had no Raise II in the alliance.
Cheese: Great THF I partied with once in Boyahda Tree.
Shellkey: Helped me and some friends out on numerous occasions. There should be a statue dedicated to her in Lower Jeuno.
Althos: Always willing to help and never complains when he dies (which happens almost every time he helps us out...lol). It was fun seeing his Flare do 1400 HP damage to Shiva.
Raye: One of the nicest people I've met in quite some time. She helped us out when we were doing RDM and SMN AF1 runs for a couple LS mates and she raised me when I got mauled by the Ash Dragon doing ZM5.
Kiaten: I've known her a while, and she's always willing to help. Most recently, she helped us take down Ifrit.
Maaglin: One heck of a good DRK in my static party.
Natsuko/Nozoko: An awesome RNG and now a good friend, even though he has a hard head.
Metora: Don't know her that well, but from the time I did hang around her, she was really nice and lots of fun. And, also, a fellow RDM.
Oryx: Helped us out with our rank 6 missions by including us in her alliance.
Some of those mentioned above I wish I could get to know better, as we didn't spend a whole lot of time together, but from what I can see, these are some of the best, kindest, most helpful players on the server.