Priest - Sanctimonius - means something like "holier-than-thou" or a hypocritical display of righteousness...if you ask me this describes 75% of the twink community quite well. Also fits a priest. Spelled wrong because you can't fit the correct spelling.
Rogue - Skanktmonius - like the priest, except skank also. Generally I chose this name because I've always found the word entertaining and it was a bit of an inside joke amongst friends/family. Again, appropriate for twinks.
The next two become obvious once you know I have a particular affinity for physics.
Hunter - Isaacshootin - As in Isaac Newton, for all intents and purposes, considered to be the father of physics. Except I'm a hunter, so I'm shootin'...things...yeah.
Paladin - CauMootrino - Sounds like "tau neutrino" i.e. the last of the fundamental particles to be discovered from the standard model of particle physics, with a cow spin on it. Hopefully we'll see news of that pesky Higgs soon. BTW this was my second choice. My first choice combined cows, paladins, and physics: Bovinediveinstein. Bovine - cow, divine - paladin, Enstein - physics. Alas, this perfect name was several characters too long, so Caumootrino it is.
Oh and finally my main twink, Skanktmonius' guild name - Lonely Atop Olympus. This is mostly a tribute to Mel Brooks and his movie, The History of the World: Part 1 in which Caesar at one point proclaims "It's so lonely at the top of Olympus!" I've always found this line absolutely hilarious, as not only does he place himself as the supreme being, Zeus, but then he has the audacity to pity himself as he has no one to call his equal. Tremendously ironic for the pig of a man depicted in the movie. So the natural implication for my guild name "Lonely Atop Olympus" is of course that I am the end all and pity myself for my solitude in supremacy. But of course in reality I'm a rather humble person and simply find that line in Brooks' film to be hilarious.